How severe is GHSA-j39j-6gw9-jw6h?

No CVSS score has been assigned to GHSA-j39j-6gw9-jw6h yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-j39j-6gw9-jw6h?

GHSA-j39j-6gw9-jw6h affects the following packages: git2 (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-j39j-6gw9-jw6h?

Update git2 to 0.20.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-j39j-6gw9-jw6h is resolved across your whole dependency graph.

How do I detect GHSA-j39j-6gw9-jw6h in my crates.io dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for git2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-j39j-6gw9-jw6h if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-j39j-6gw9-jw6h actively exploited in the wild?

No public exploit code has been indexed for GHSA-j39j-6gw9-jw6h yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-j39j-6gw9-jw6h published, and has it been updated?

GHSA-j39j-6gw9-jw6h was published on February 4, 2026 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

git2 has potential undefined behavior when dereferencing…

Real-World Exposure

1 pkg affected

🦀git2

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

If the Buf struct is dereferenced immediately after calling new() or default() on the Buf struct, a null pointer is passed to the unsafe function slice::from_raw_parts. According to the safety section documentation of the function, data must be non-null and aligned even for zero-length slices or slices of ZSTs. Thus, passing a null pointer will lead to undefined behavior.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`git2`	all versions	0.20.4`cargo update -p git2 --precise 0.20.4`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for git2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update git2 to 0.20.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-j39j-6gw9-jw6h is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

If the Buf struct is dereferenced immediately after calling new() or default() on the Buf struct, a null pointer is passed to the unsafe function slice::from_raw_parts. According to the safety section documentation of the function, data must be non-null and aligned even for zero-length slices or slices of ZSTs. Thus, passing a null pointer will lead to undefined behavior.

O3 Security · Impact-Aware SCA

Is GHSA-j39j-6gw9-jw6h in your dependencies?

Find it across crates.io, including transitive dependencies.

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git2 has potential undefined behavior when dereferencing Buf structGHSA-j39j-6gw9-jw6h