CVE-2026-50185: Cmov/CmovEq on aarch64 can produce wrong results if high-bits of registers are set
Affects cmovSource GCVE Database
Not known to be exploited : upgrade to 0.5.4 when convenient.
Data as of 30 Oct 2026, 11:52 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 0.5.4
Exploitation evidence
Disclosed: evidence found.
CVE published 17 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade cmov to 0.5.4.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| crates.iocmov | Affected
| Fixed in
|
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AI-suggested
Users should upgrade to version 0.5.4 or later once available, as the affected versions are from 0.1.1 up to but not including 0.5.4. If you cannot patch yet, users should review their usage of the Cmov and CmovEq functions on aarch64 to assess potential impact.
Description
The Rust crate 'cmov' contains a vulnerability in its aarch64 implementation of the Cmov and CmovEq functions. The issue arises because high bits of registers are not correctly handled when loading values smaller than the register size, causing conditional move operations to produce incorrect results if those high bits are set. This affects versions from 0.1.1 up to but not including 0.5.4. No known exploits exist, and the impact depends on how the crate is used in specific contexts.
References
- github.com/RustCrypto/utils/security/advisories/GHSA-3rjw-m598-pq24 (opens in a new tab)
- github.com/RustCrypto/utils (opens in a new tab)
- github.com/RustCrypto/utils/commit/dba6c355c9f241e3726d5ec2a68f9f3b519f6063 (opens in a new tab)
- github.com/RustCrypto/utils/releases/tag/cmov-v0.5.4 (opens in a new tab)