VULNERABILITY INTELLIGENCE

CVE-2026-6091

CVSS score6 MEDIUM
EPSS probability0.19%
CISA KEVNot currently listed
Published2026-06-25
Last modified2026-06-26
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

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.

Weakness classification

  • CWE-295: Improper Certificate Validation

Primary references