Improper Certificate Validation in wolfSSL - CVE-2026-6450
Published: July 1, 2026
Vulnerability identifier: #VU136656
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-2026-6450
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: wolfSSL
Affected software:
wolfSSL
wolfSSL
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass CRL critical extension enforcement.
The vulnerability exists due to improper certificate validation in ParseCRL_Extensions when parsing CRLs with unhandled critical extensions. A remote attacker can supply a crafted CRL with an unhandled critical extension to bypass CRL critical extension enforcement.
Only builds with CRL support enabled are affected, and the crafted CRL must have a trusted signature when parsed.
How to mitigate CVE-2026-6450
Install security update from vendor's website.