CVE-2025-11931: wolfSSL

High severity, CVSS 8.2. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• wolfSSL wolfSSL: version 5.8.4 only

Published 2025-11-21. Last modified 2026-06-17.