CVE-2026-6091 — MEDIUM (6.5)

Q: How severe is CVE-2026-6091?

CVE-2026-6091 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-6091?

Check the references section above for vendor advisories and patch information. Affected products include: Wolfssl Wolfssl.

Vulnerability 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 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Wolfssl	Wolfssl	>= 5.7.4, < 5.9.2

Related Weaknesses (CWE)

CWE-295

References

https://github.com/wolfSSL/wolfssl/pull/10170Issue TrackingPatch
https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory

FAQ

What is CVE-2026-6091?

CVE-2026-6091 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...

How severe is CVE-2026-6091?

CVE-2026-6091 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-6091?

Check the references section above for vendor advisories and patch information. Affected products include: Wolfssl Wolfssl.