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.

CVSS 4.0

2.0CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-25)

CWE

CWE-758

Published

2026-07-17

Modified

2026-10-24

Record from

the NVD, synced 2026-10-25

Affected

• rustcrypto:cmov

Packages (OSV)

References

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

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