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CVE-2025-61729

Excessive resource consumption when printing error string for host certificate validation in crypto/x509

Published: Dec 2, 2025Updated: Dec 19, 2025 Sources: CVE List NVD BDUCWE-295
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 64.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Within HostnameError.Error(), when constructing an error string, there is no limit to the number of hosts that will be printed out. Furthermore, the error string is constructed by repeated string concatenation, leading to quadratic runtime. Therefore, a certificate provided by a malicious actor can result in excessive resource consumption.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-295

Affected Products

gogolangOSS Libraries
crypto/x509Go standard library
Library
OSS Libraries / go
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
CBL MarinerMicrosoft Corp
On-prem
Operating Systems / windows
Windows Azure Linux AgentMicrosoft Corp
On-prem
Operating Systems / windows
golangoss-projectUSOSS Libraries
go standard libraryoss-projectUSOSS Librariesaka golang standard library, net/http, crypto/x509, html/template
ооо «ред софт»commercialRUOperating Systemsaka red soft
microsoft corpcommercialUSOperating Systemsaka microsoft corporation
and 6 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/725920
go.dev
https://go.dev/issue/76445
go.dev
https://groups.google.com/g/golang-announce/c/8FJoBkPddm4
groups.google.com
and 8 more references View all →

Timeline

Published
Dec 2, 2025
Last Updated
Dec 19, 2025

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