CVE-2026-23519 — RustCrypto cmov: thumbv6m-none-eabi compiler emits non-constant time assembly when using cmovnz
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. Pr…
Published: 2026-01-15 · CVSS: 8.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7