CVE-2026-6091

wolfSSL

Published 25 Jun 2026 · updated 26 Jun 2026 · Analyzed

6.0 Medium · CVSS 4.0, wolfssl.com

Description

Partial-chain certificate verification may accept chains that terminate at a peer-supplied, untrusted intermediate certificate rather than a trusted anchor. An attacker could present a chain that ends at an intermediate they control and have it accepted as valid. This affects the OpenSSL compatibility certificate-path-building path (wolfSSL_X509_verify_cert / X509_STORE, OPENSSL_EXTRA) when the X509_V_FLAG_PARTIAL_CHAIN verify flag is enabled.

References

github.com/wolfSSL/wolfssl/pull/10170 · Issue Tracking, Patch
www.wolfssl.com/docs/security-vulnerabilities/ · Vendor Advisory