CVE-2025-61727
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-03

Last updated on: 2025-12-18

Assigner: Go Project

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.
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Meta Information
Published
2025-12-03
Last Modified
2025-12-18
Generated
2026-06-16
AI Q&A
2025-12-03
EPSS Evaluated
2026-06-15
NVD
CVE-2025-61727
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
golang go 1.25.0
golang go 1.25.5
golang go 1.24.11
golang go From 1.25.0 (inc) to 1.25.2 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-295 The product does not validate, or incorrectly validates, a certificate.
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Executive Summary

This vulnerability involves an excluded subdomain constraint in a certificate chain that fails to restrict the usage of wildcard Subject Alternative Names (SANs) in the leaf certificate. Specifically, even if a constraint excludes a subdomain like test.example.com, the leaf certificate can still claim a wildcard SAN such as *.example.com, effectively bypassing the intended restriction.

Impact Analysis

This vulnerability can allow unauthorized certificates to be accepted for subdomains that were intended to be excluded, potentially enabling attackers to impersonate subdomains and intercept or manipulate secure communications.

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