CVE-2026-23519

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.

PUBLISHED Reserved 2026-01-13 | Published 2026-01-15 | Updated 2026-01-15 | Assigner GitHub_M

Problem types

CWE-208: Observable Timing Discrepancy

Product status

References

github.com/.../utils/security/advisories/GHSA-2gqc-6j2q-83qp exploit

github.com/.../utils/security/advisories/GHSA-2gqc-6j2q-83qp

github.com/...ommit/55977257e7c82a309d5e8abfdd380a774f0f9778

cve.org (CVE-2026-23519)

nvd.nist.gov (CVE-2026-23519)

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