CVE-2026-23519

CRITICAL

9.8

Description

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published1/15/2026

Last Modified1/23/2026

Sourcenvd

Honeypot Sightings0

Affected Products

rustcrypto:cmov

Weaknesses (CWE)

CWE-208CWE-203

References

https://github.com/RustCrypto/utils/commit/55977257e7c82a309d5e8abfdd380a774f0f9778(security-advisories@github.com)

https://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qp(security-advisories@github.com)

https://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qp(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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