CVE-2025-11931: Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a…
CVE-2025-11931 · Severity: high · CVSS 8.2 · Published 2025-11-21
Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wc_XChaCha20Poly1305_Decrypt() which is not used with TLS connections, only from direct calls from an application.
No. Junglewise Threat Intelligence has no report of CVE-2025-11931 being exploited in the wild.
How severe is CVE-2025-11931?
High severity, with a CVSS score of 8.2, published 21 November 2025.
Which products and versions are affected?
Wolfssl. The advisory does not name versions.
Is there a fix for CVE-2025-11931?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-11931?
Check whether you run Wolfssl. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.