Vulnerability Details 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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 1.6%
CVSS Severity
CVSS v3 Score 3.3
References
Products affected by CVE-2026-50185
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cpe:2.3:a:rustcrypto:cmov:0.1.1
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cpe:2.3:a:rustcrypto:cmov:0.2.0
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cpe:2.3:a:rustcrypto:cmov:0.3.0
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cpe:2.3:a:rustcrypto:cmov:0.3.1
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cpe:2.3:a:rustcrypto:cmov:0.4.0
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cpe:2.3:a:rustcrypto:cmov:0.4.1
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cpe:2.3:a:rustcrypto:cmov:0.4.2
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cpe:2.3:a:rustcrypto:cmov:0.4.3
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cpe:2.3:a:rustcrypto:cmov:0.4.4
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cpe:2.3:a:rustcrypto:cmov:0.4.6
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cpe:2.3:a:rustcrypto:cmov:0.5.0
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cpe:2.3:a:rustcrypto:cmov:0.5.1
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cpe:2.3:a:rustcrypto:cmov:0.5.2