Partial-chain verification accepts untrusted intermediate as trust anchor_CVE-2026-6091

6 / 10

MEDIUM

CVSS: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.

Basic Information

ID CVE-2026-6091

Source wolfSSL

Published Jun 25, 2026 at 16:46

Modified Jun 25, 2026 at 17:58

Affected Product

Vendor wolfSSL

Product wolfSSL

Version 5.7.4

Affected Versions wolfSSL wolfSSL 5.7.4

CWE Classification

CWE-295

References

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    "published": "2026-06-25T16:46:12.599Z",
    "modified": "2026-06-25T17:58:31.045Z",
    "type": "cve",
    "title": "Partial-chain verification accepts untrusted intermediate as trust anchor",
    "source": "wolfSSL",
    "references": "https://github.com/wolfSSL/wolfssl/pull/10170\nhttps://www.wolfssl.com/docs/security-vulnerabilities/",
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