CVE-2025-61727
Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509
Description
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.
INFO
Published Date :
Dec. 3, 2025, 8:16 p.m.
Last Modified :
Dec. 18, 2025, 8:15 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update certificate policies to restrict wildcard SANs.
- Implement stricter validation for SANs against excluded subdomains.
- Reissue affected certificates with correct constraints.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-61727.
| URL | Resource |
|---|---|
| https://go.dev/cl/723900 | Patch |
| https://go.dev/issue/76442 | Issue Tracking |
| https://groups.google.com/g/golang-announce/c/8FJoBkPddm4 | Mailing List Release Notes |
| https://pkg.go.dev/vuln/GO-2025-4175 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-61727 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-61727
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-61727 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-61727 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Dec. 18, 2025
Action Type Old Value New Value Added CWE CWE-295 Added CPE Configuration OR *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions up to (excluding) 1.24.11 *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions from (including) 1.25 up to (excluding) 1.25.5 Added Reference Type Go Project: https://go.dev/cl/723900 Types: Patch Added Reference Type Go Project: https://go.dev/issue/76442 Types: Issue Tracking Added Reference Type Go Project: https://groups.google.com/g/golang-announce/c/8FJoBkPddm4 Types: Mailing List, Release Notes Added Reference Type Go Project: https://pkg.go.dev/vuln/GO-2025-4175 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Dec. 03, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N -
New CVE Received by [email protected]
Dec. 03, 2025
Action Type Old Value New Value Added Description 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. Added Reference https://go.dev/cl/723900 Added Reference https://go.dev/issue/76442 Added Reference https://groups.google.com/g/golang-announce/c/8FJoBkPddm4 Added Reference https://pkg.go.dev/vuln/GO-2025-4175