CVE-2026-6731

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

State: Published
Severity: 6.0 Medium
Published: Jun 25, 2026
Updated: Jun 26, 2026
Reserved: Apr 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	wolfSSL

Weaknesses

CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
wolfSSLwolfSSL	3.9.10 through 5.9.1Affected

References

https://github.com/wolfSSL/wolfssl/pull/10223patch
https://www.wolfssl.com/docs/security-vulnerabilities/

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