CVE-2026-6091 — Partial-chain verification accepts untrusted intermediate as trust anchor

CVE-2026-6091

Partial-chain verification accepts untrusted intermediate as trust anchor PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
wolfSSL / wolfSSL	affected 5.7.4 through 5.9.1

CWE

CWE-295

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.