🛡️ CVE-2025-52496 on Debian — mbedtls

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Distribution advisory

This page covers CVE-2025-52496 as tracked by Debian, for the package mbedtls. The fix is available in version 3.6.4-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

DEBIAN-CVE-2025-52496 is classified as CWE-733: Compiler Optimization Removal or Modification of Security-critical Code. The developer builds a security-critical protection mechanism into the software, but the compiler optimizes the program such that the mechanism is removed or modified.

Affected software

DEBIAN-CVE-2025-52496 is recorded against 1 package.

  • mbedtls (fixed in 3.6.4-1)

Timeline and source

Published on 4 July 2025 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2025-52496 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-07-04
Updated 2026-08-20
Modified 2026-08-04
Fix URL N/A

Affected Packages

Software From version Fixed in
mbedtls — 3.6.4-1

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