What is CVE-2026-23519?

CVE-2026-23519 is a critical-severity vulnerability in Rustcrypto Cmov, classified under CWE-208. CVSS score: 9.8/10. Published 2026-01-15.

How severe is CVE-2026-23519?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Rustcrypto Cmov

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) c…

EPSS: 0.005 (38.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Rustcrypto Cmov
Rustcrypto Utils — versions < 0.4.4

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-23519?: CVE-2026-23519 is a critical-severity vulnerability in Rustcrypto Cmov, classified under CWE-208. CVSS score: 9.8/10. Published 2026-01-15.
How severe is CVE-2026-23519?: Critical severity. CVSS v3 base score is 9.8 out of 10.