Vulnerability Description
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 Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Rustcrypto | Cmov | >= 0.1.1, < 0.5.4 |
Related Weaknesses (CWE)
References
- https://github.com/RustCrypto/utils/commit/dba6c355c9f241e3726d5ec2a68f9f3b519f6Patch
- https://github.com/RustCrypto/utils/releases/tag/cmov-v0.5.4Product
- https://github.com/RustCrypto/utils/security/advisories/GHSA-3rjw-m598-pq24ExploitVendor Advisory
- https://github.com/RustCrypto/utils/security/advisories/GHSA-3rjw-m598-pq24ExploitVendor Advisory
FAQ
What is CVE-2026-50185?
CVE-2026-50185 is a vulnerability with a CVSS score of 3.3 (LOW). 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, t...
How severe is CVE-2026-50185?
CVE-2026-50185 has been rated LOW with a CVSS base score of 3.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-50185?
Check the references section above for vendor advisories and patch information. Affected products include: Rustcrypto Cmov.