Vulnerability Details CVE-2026-23519
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. Prior to 0.4.4, the thumbv6m-none-eabi (Cortex M0, M0+ and M1) compiler emits non-constant time assembly when using cmovnz (portable version). This vulnerability is fixed in 0.4.4.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 17.5%
CVSS Severity
CVSS v3 Score 9.8
References
Products affected by CVE-2026-23519
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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