CVE-2025-52496 Race condition in mbedtls
A race condition in Mbed TLS allows attackers to extract AES keys or forge GCM tags in multithreaded applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-52496?
CVE-2025-52496 is a high-severity vulnerability in Arm Mbed Tls, published on 4 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-733
Which versions are affected by CVE-2025-52496?
It affects 1 product.
Products include Arm Mbed Tls.
How do I fix CVE-2025-52496?
Upgrade to a fixed version.
Is CVE-2025-52496 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-52496 exists.
Other vulnerabilities in Arm Mbed Tls
Sources
Also known as ALPINE-CVE-2025-52496, DEBIAN-CVE-2025-52496, GHSA-qc26-g9mm-wmmf, JLSEC-2025-228, ROOT-OS-DEBIAN-12-CVE-2025-52496, UBUNTU-CVE-2025-52496.