CVE-2026-50185

RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewritten as branches by the compiler. From 0.1.1 until 0.5.4, the aarch64 implementations of Cmov and CmovEq in cmov/src/backends/aarch64.rs assume high bits are zero-extended when loading values smaller than a register, so set high bits such as [8..] in a Cmov selector or [16..] of self or other in the u16 and i16 CmovEq implementations can cause left.cmovz(&right, condition) to produce incorrect output. This issue is fixed in version 0.5.4.

Score

CVSS 3.1 3.3 Low

Status

Analyzed - security-advisories@github.com

Published

2026-07-17

Last modified

2026-10-24

Weaknesses

CWE-758

Affected products

• Cmov (Rustcrypto)
• Utils (Rustcrypto)

References

• https://github.com/RustCrypto/utils/security/advisories/GHSA-3rjw-m598-pq24
• https://github.com/RustCrypto/utils/commit/dba6c355c9f241e3726d5ec2a68f9f3b519f6063
• https://github.com/RustCrypto/utils/releases/tag/cmov-v0.5.4