CVE-2026-6731

HIGH

X.509 name constraint bypass via Subject CN treated as a DNS name

Title source: cna

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.

References (2)

Core 2

Core References

Patch patch

https://github.com/wolfSSL/wolfssl/pull/10223

https://www.wolfssl.com/docs/security-vulnerabilities/

Scores

CVSS v3 7.5

EPSS 0.0012

EPSS Percentile 2.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-295

Status published

Products (2)

wolfSSL/wolfSSL 3.9.10 - 5.9.1

wolfssl/wolfssl 3.9.10 - 5.9.2

Published Jun 25, 2026

Tracked Since Jun 26, 2026