CVE-2026-6731

High

Description

X.509 name constraint bypass via the Subject Common Name when treated as a DNS-type name. A certificate whose Subject CN violates an issuing CA's DNS name constraints could be accepted.

SeverityHigh

CVSS7.5

Exploit probability—

ProductWolfssl

PublishedJun 25, 2026

First seenJun 25, 2026

Weakness typeCWE-295CWE-295

How to fix

Update

wolfssl wolfssl5.9.2 or later

Patches

github.com/wolfSSL/wolfssl/pull/10223

Affected products

Product	Affected versions	Fixed in
wolfssl wolfssl	3.9.10 ≤ v < 5.9.2	5.9.2

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