medium5.5
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 b…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | cmov | >= 0.1.1, < 0.5.4 | 0.5.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Rustcrypto | Cmov | from 0.1.1 before 0.5.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-3rjw-m598-pq24
- 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