What’s Vulnerable › Vulnerabilities

CVE-2025-13912: Potential non-constant time compiled code with Clang LLVM

• Severity: low (CVSS 1.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-11 · updated 2026-10-14
• Weakness: CWE-203

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.

Affected products

• wolfSSL: before 5.8.4 — fixed in 5.8.4

How to fix

Upgrade to a fixed version: wolfSSL 5.8.4. Check the vendor advisory for mitigations.

References

• https://github.com/wolfSSL/wolfssl/pull/9148

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