CVE-2026-6091

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.

CVSS Vector

Affected Products

References

• https://github.com/wolfSSL/wolfssl/pull/10170
• https://www.wolfssl.com/docs/security-vulnerabilities/