Improper Certificate Validation in wolfSSL - CVE-2026-6091

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Main Vulnerability Database Vulnerabilities #VU136634

Improper Certificate Validation in wolfSSL - CVE-2026-6091

Published: July 1, 2026


Vulnerability identifier: #VU136634
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-6091
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: wolfSSL
Affected software:
wolfSSL

Detailed vulnerability description

The vulnerability allows a remote attacker to bypass certificate chain validation.

The vulnerability exists due to improper certificate validation in partial-chain certificate verification when processing a chain that terminates at a peer-supplied intermediate certificate. A remote attacker can present a crafted certificate chain to bypass certificate chain validation.


How to mitigate CVE-2026-6091

Install security update from vendor's website.

Sources