# CVE-2026-23519

## Summary

- **CVE ID:** CVE-2026-23519
- **Severity:** HIGH
- **CVSS Score:** 8.9 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N)
- **CWE:** CWE-208
- **Published:** Jan 15, 2026
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- RustCrypto — utils (< 0.4.4)

## References

- [CNA](https://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qp)
- [CNA](https://github.com/RustCrypto/utils/commit/55977257e7c82a309d5e8abfdd380a774f0f9778)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.53%
- **EPSS Percentile:** 43.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._