Home/CVE/An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certifi
CVE

CVE-2025-61727

An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certifi

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.

MEDIUM · CVSS 6.5 EPSS 8e-05
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-295Improper Certificate Validation
▤

Affected Products & Versions

2
golang go< 1.24.11
golang go>= 1.25 and < 1.25.5
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go stdlib fixed in 1.24.11, 1.25.5
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · security@golang.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 Dec 2025 · 08:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

27
rhsaRHSA-2026:7385Moderate
rhsaRHSA-2026:7291Moderate
suse-csafopenSUSE-SU-2026:20301-1
suse-csafopenSUSE-SU-2026:20308-1
suse-csafSUSE-SU-2026:20623-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://go.dev/cl/723900Patch
https://go.dev/issue/76442Issue Tracking
https://groups.google.com/g/golang-announce/c/8FJoBkPddm4Mailing ListRelease Notes
https://pkg.go.dev/vuln/GO-2025-4175Vendor Advisory
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