CVE-2026-6731 | BDVDB-2026-342995 Detail

wolfSSLwolfSSL

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.

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-295 Improper Certificate Validation

References#

Exploit#

No public exploit known

History#

Version 12026-06-25Record published in the CVE List.
Version 22026-06-26Most recent update recorded in the CVE List.

Published

Published: 2026-06-25
Last modified: 2026-06-26

Vendor information

Vendor: wolfSSL
Product: wolfSSL

All wolfSSL vulnerabilities

Score

6.0 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 2.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 3.9.10 and <= 5.9.1
Fixed
Not stated

Scoring System

CVSS v4.0

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	Low
User Interaction	None
Vulnerable System Confidentiality	None
Vulnerable System Integrity	High
Vulnerable System Availability	None
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).