CVE-2025-61727

MEDIUM6.5

Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509

Published Dec 3, 2025

Modified 1 months ago

Details

An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.

References

WEBhttps://go.dev/cl/723900 WEBhttps://go.dev/issue/76442 WEBhttps://groups.google.com/g/golang-announce/c/8FJoBkPddm4 WEBhttps://pkg.go.dev/vuln/GO-2025-4175 ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2025-61727

CVSS Analysis

CVSS v3.1

6.5

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

UnchangedS:U

Impact

Confidentiality

LowC:L

Integrity

LowI:L

Availability

NoneA:N

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

Ecosystems

Timeline

PublishedDec 3, 2025

ModifiedDec 3, 2025