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CVE-2025-61727

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

Published: Dec 3, 2025Updated: Dec 18, 2025 Sources: CVE List NVD BDUCWE-295
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 81.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-295

Affected Products

crypto/x509Go standard library
Library
OSS Libraries / go
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
GoThe Go ProjectOSS Libraries
Platform V SberLinux OS ServerАО «СберТех»
On-premOS
Operating Systems / linux-distro
Аврора ЦентрООО "Открытая мобильная платформа"
On-prem
Operating Systems / mobile-os
go standard libraryoss-projectUSOSS Librariesaka golang standard library, net/http, crypto/x509, html/template
ооо «ред софт»commercialRUOperating Systemsaka red soft
the go projectoss-projectOSS Librariesaka go, golang-google-protobuf, crypto
ао «сбертех»commercialRUOperating Systemsaka ao sbertech, сбертех
ооо "открытая мобильная платформа"commercialRUOperating Systems
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://go.dev/cl/723900
go.dev
https://go.dev/issue/76442
go.dev
https://groups.google.com/g/golang-announce/c/8FJoBkPddm4
groups.google.com
and 5 more references View all →

Timeline

Published
Dec 3, 2025
Last Updated
Dec 18, 2025

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