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CVE-2026-119332high8.8

Ladybird: FinalizationRegistry::cleanup() heap use-after-free via reentrant unregister()

Impact

Ladybird browser versions before 209579c96473c75bd5eba9701fcadb841a045964 have a use-after-free weakness in FinalizationRegistry::cleanup(). An attacker with access to the browser's JavaScript callback can cause a crash or memory corruption.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

LadybirdBrowser · GitHub_M

ladybird

1 range
GitHub_M version evidence

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affected

< 209579c96473c75bd5eba9701fcadb841a045964

unaffected

unknown

Other versions: unknown

Original source description

Ladybird is a truly independent web browser. Prior to 209579c96473c75bd5eba9701fcadb841a045964, FinalizationRegistry::cleanup() in Libraries/LibJS/Runtime/FinalizationRegistry.cpp removed a dead record from m_records, retained an iterator to the next FinalizationRecord, and then invoked attacker-controlled JavaScript through the cleanup callback. If that callback called unregister() for the next record, remove_by_token() freed the node referenced by the retained iterator, and the next cleanup iteration read its target and held_value fields after free. This reliably crashes instrumented WebContent builds and creates a memory-corruption primitive in production builds. This vulnerability is fixed by commit 209579c96473c75bd5eba9701fcadb841a045964.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-119332

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Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-416 ↗

CWE-416: Use After Free

GitHub_M

Related →
Contributing organizations · 1
GitHub_M

Assigning organization

2026-10-30

What changed

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References

2 sources
github.com/LadybirdBrowser/ladybird/security/advisories/GHSA-6cmv-xmff-qjph
Security advisoryGitHub_M
github.com/LadybirdBrowser/ladybird/commit/209579c96473c75bd5eba9701fcadb841a045964
PatchGitHub_M