Industrial
CVE-2026-23519
CRITICAL
GHSA-2gqc-6j2q-83qp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
RustCrypto CMOV before 0.4.4 emits non-constant-time assembly on ARM Cortex-M0/M0+/M1 targets. Cryptographic operations that rely on constant-time guarantees are broken on these embedded platforms. PoC available, patch available.
Technical ContextAI
The cmovnz portable implementation compiles to branching (non-constant-time) assembly on thumbv6m-none-eabi (CWE-208). Cryptographic code using CMOV for secret-dependent operations leaks timing information.
RemediationAI
Update to CMOV 0.4.4.
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External POC / Exploit Code
Leaving vuln.today