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  4. CVE 2026 119331 ladybird missing origin clean enforcement in
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Back to active CVEs
High · CVSS 7.1CVE-2026-119331

Ladybird: Missing origin-clean enforcement in CSSStyleSheet allows cross-origin CSS read and mutationCVE-2026-119331

Answer in brief

CVE-2026-119331 records a High severity (CVSS 7.1) vulnerability in Ladybird: Missing origin-clean enforcement in CSSStyleSheet allows cross-origin CSS read and mutation. The current sources do not mark it as known exploited. The current feed maps LadybirdBrowser/ladybird (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 30, 2026Updated Oct 30, 2026Source checked Oct 30, 2026First seen by HOL Oct 30, 2026Material review Oct 30, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps LadybirdBrowser/ladybird (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
LadybirdBrowser/ladybirdgeneric<c0d68bddf3e3616e5173835f0f4c155ee9700d91c0d68bddf3e3616e5173835f0f4c155ee9700d91

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for LadybirdBrowser/ladybird.
  2. 2Review the reported fix. Update LadybirdBrowser/ladybird to c0d68bddf3e3616e5173835f0f4c155ee9700d91 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 30, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Ladybird is a truly independent web browser. Prior to the c0d68bddf3e3616e5173835f0f4c155ee9700d91 commit, CSSStyleSheet.cssRules, insertRule(), and deleteRule() in Libraries/LibWeb/CSS/CSSStyleSheet.cpp did not enforce the stylesheet origin-clean flag with the required SecurityError, even though cross-origin imported stylesheets were correctly marked non-origin-clean. A malicious page could read parsed rules from a stylesheet loaded without CORS and could insert or delete rules in the victim stylesheet, bypassing the Same-Origin Policy. Reading could expose selectors, generated content, feature markers, or other sensitive rule text, while mutation could alter page visibility or layout. The issue does not provide memory corruption, code execution, or persistence after the attacker page closes. This vulnerability is fixed by commit c0d68bddf3e3616e5173835f0f4c155ee9700d91.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Ladybird: FinalizationRegistry::cleanup() heap use-after-free via reentrant unregister()Same ladybirdbrowser/ladybird package
  • Arc: DuckDB I/O aliases bypass database RBAC after CVE-2026-47735Also CWE-200
  • jack: upstream error responses expose backend and peer credentialsAlso CWE-200

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-200, CWE-346
Source
CVE List V5
Source checked
Oct 30, 2026
References
2 linked sources
Open source record