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🛡️ GHSA-r24f-hg58-vfrw — unsafe-libyaml

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

unsafe-libyaml unaligned write of u64 on 32-bit and 16-bit platforms

Affected versions allocate memory using the alignment of usize and write data to it of type u64, without using core::ptr::write_unaligned. In platforms with sub-64bit alignment for usize (including wasm32 and x86) these writes are insufficiently aligned some of the time.

If using an ordinary optimized standard library, the bug exhibits Undefined Behavior so may or may not behave in any sensible way, depending on optimization settings and hardware and other things. If using a Rust standard library built with debug assertions enabled, the bug manifests deterministically in a crash (non-unwinding panic) saying _"ptr::write requires that the pointer argument is aligned and non-null"_.

No 64-bit platform is impacted by the bug.

The flaw was corrected by allocating with adequately high alignment on all

platforms.

Affected software

GHSA-r24f-hg58-vfrw is recorded against 1 package.

  • unsafe-libyaml

Timeline and source

Published on 21 December 2023 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Package)
rustsec.org (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2023-12-21
Updated 2026-08-20
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
unsafe-libyaml — —

Similar Threats

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