CVE-2025-13912 Potential non-constant time compiled code with Clang LLVM
LLVM optimizations may break constant-time implementations in wolfSSL, enabling timing side-channel attacks that leak sensitive cryptographic information.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-13912?
CVE-2025-13912 is a low-severity vulnerability in wolfSSL, published on 11 Dec 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Multiple constant-time implementations in wolfSSL before version 5.8.4 may be transformed into non-constant-time binary by LLVM optimizations, which can potentially result in observable timing discrepancies and lead to information disclosure through timing side-channel attacks.
Weakness: CWE-203
Which versions are affected by CVE-2025-13912?
How do I fix CVE-2025-13912?
Upgrade to a fixed version.
Is CVE-2025-13912 being exploited?
There is no known exploitation of CVE-2025-13912 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-13912, GHSA-7582-g6xx-939j, JLSEC-2026-688, UBUNTU-CVE-2025-13912.