How severe is GHSA-5m39-wx2q-mxg3?

No CVSS score has been assigned to GHSA-5m39-wx2q-mxg3 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-5m39-wx2q-mxg3?

GHSA-5m39-wx2q-mxg3 affects the following packages: lzf (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-5m39-wx2q-mxg3?

Update lzf to 0.3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5m39-wx2q-mxg3 is resolved across your whole dependency graph.

How do I detect GHSA-5m39-wx2q-mxg3 in my crates.io dependencies?

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

How do I mitigate GHSA-5m39-wx2q-mxg3 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-5m39-wx2q-mxg3 actively exploited in the wild?

No public exploit code has been indexed for GHSA-5m39-wx2q-mxg3 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-5m39-wx2q-mxg3 published, and has it been updated?

GHSA-5m39-wx2q-mxg3 was published on November 8, 2022 and was last updated on November 8, 2023. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🦀 crates.io

Not in CISA KEV

Invalid use of `mem::uninitialized` causes `use-of-uninitialized-value`GHSA-5m39-wx2q-mxg3

Fix: badboy/lzf-rs@b633bf2

GHSA-5m39-wx2q-mxg3 is a security vulnerability in lzf. A fix is available for lzf — see the affected versions and patch details below.

Also known asRUSTSEC-2022-0067

Published

Nov 8, 2022

Updated

Nov 8, 2023

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 8, 2023 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🦀lzf

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

The compression and decompression function used mem:uninitialized to create an array of uninitialized values, to later write values into it. This later leads to reads from uninitialized memory.

The flaw was corrected in commit b633bf265e41c60dfce3be7eac4e4dd5e18d06cf by using a heap-allocated Vec and removing out use of mem::uninitialized. The fix was released in v0.3.2 and v1.0.0

Subsequently, the crate was deprecated and its use is discouraged.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`lzf`	all versions	0.3.2`cargo update -p lzf --precise 0.3.2`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for lzf, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update lzf to 0.3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5m39-wx2q-mxg3 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

The compression and decompression function used `mem:uninitialized` to create an array of uninitialized values, to later write values into it. This later leads to reads from uninitialized memory. The flaw was corrected in commit b633bf265e41c60dfce3be7eac4e4dd5e18d06cf by using a heap-allocated `Vec` and removing out use of `mem::uninitialized`. The fix was released in v0.3.2 and v1.0.0 Subsequently, the crate was deprecated and its use is discouraged.

O3 Security · Impact-Aware SCA

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