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CVE-2025-11934

2.1 low SSVC exploitation: poc Analyzed
NVD · CVE.org

Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 2.1 · wolfsslNVD modified 2026-10-19 13:10

Affected (CPE criteria) 1

  • cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*

References 3