JLSEC-2025-228 High 7.8

Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations...

JLSEC Published: Nov 21, 2025
Modified: Jul 23, 2026
Severity: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Affected Packages: MbedTLS_jll < 2.28.1010+0
Upstream: CVE-2025-52496

Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations occur. An attacker may be able to extract an AES key from a multithreaded program, or perform a GCM forgery.

References

https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-1.md
https://lists.debian.org/debian-lts-announce/2025/08/msg00013.html