RustCrypto utils up to 0.5.3 aarch64 Backend aarch64.rs cmovz calculation

Summaryinfo

A vulnerability labeled as problematic has been found in RustCrypto utils up to 0.5.3. The impacted element is the function cmovz of the file cmov/src/backends/aarch64.rs of the component aarch64 Backend. The manipulation results in calculation. This vulnerability is cataloged as CVE-2026-50185. The attack must be initiated from a local position. There is no exploit available.

Detailsinfo

A vulnerability was found in RustCrypto utils up to 0.5.3. It has been classified as problematic. Affected is the function cmovz of the file cmov/src/backends/aarch64.rs of the component aarch64 Backend. The manipulation with an unknown input leads to a calculation vulnerability. CWE is classifying the issue as CWE-682. The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-50185 since 06/04/2026. The exploitability is told to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 0.5.4 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• RustCrypto

Name

• utils

Version

• 0.5.0
• 0.5.1
• 0.5.2
• 0.5.3

Website

• Product: https://github.com/RustCrypto/utils/

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