CVE-2026-23519

Summary

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.

Affected Software

Weaknesses

• CWE-208: CWE-208: Observable Timing Discrepancy

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

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

References

• https://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qp
• https://github.com/RustCrypto/utils/commit/55977257e7c82a309d5e8abfdd380a774f0f9778

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