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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
6.5MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 79.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

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
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Weaknesses

CWE-295

Affected Products

Go standard library
oss-project·USaka net/http, crypto/x509, html/template, golang standard library
crypto/x509LibraryLibrary
OSS Libraries / generic-library
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
The Go Project
oss-projectaka crypto, go, golang-google-protobuf
Go
OSS Libraries
АО «СберТех»
commercial·RUaka ao sbertech, сбертех
Platform V SberLinux OS ServerOn-premOS
Operating Systems / linux-distro
ООО "Открытая мобильная платформа"
commercial·RU
Аврора ЦентрOn-prem
Operating Systems / mobile-os
golang
oss-project·US
go
OSS Libraries

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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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 →

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