CVSS 4.0
8.9 highCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:NCVE-2026-23519
High (8.9) in rustcrypto cmov. EPSS 0.6% chance of exploitation in the next 30 days. Fixed in cmov 0.4.4.
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.
Severity
CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-203, CWE-208
- Published
- Modified
- Record from
- the NVD, synced
Affected
- rustcrypto:cmov
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-2gqc-6j2q-83qp | crates.io | cmov | <0.4.4 | 0.4.4 |
| RUSTSEC-2026-0003 | crates.io | cmov | >=0.0.0-0 <0.4.4 | 0.4.4 |