CVE-2026-50185
RustCrypto Cmov/CmovEq on aarch64 can produce wrong results if high-bits of registers are set
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-758 |
| Vendor | rustcrypto |
| Product | utils |
| Published | Jul 17, 2026 |
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Affected Versions
RustCrypto / utils
>= 0.1.1, < 0.5.4