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Vulnerability record · CVE-2025-61729 · published 2 December 2025

CVE-2025-61729: Golang go improper certificate validation vulnerability

Golang · Go

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.

7.5 CVSS 3.1 High EPSS 0.46% · top 62.9% CWE-295 · Improper certificate validation
7.5CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://go.dev/cl/725920 Patch
https://go.dev/issue/76445 Issue TrackingPatch
https://groups.google.com/g/golang-announce/c/8FJoBkPddm4 Mailing ListRelease Notes
https://pkg.go.dev/vuln/GO-2025-4155 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-61729), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.