CVE WatchAug 18, 2026

CVE-2026-50185

RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewr

CVSS

3.3

Low

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Jul 17, 2026 · Last modified: Aug 18, 2026 · CWE-758

EPSS · 30d

0.1%EPSS · 30 days0.2%

2026-08-082026-09-04

Technical 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.

Official references

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