Multiple vulnerabilities in Go programming language

Published: 2025-12-06

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2025-61729 CVE-2025-61727
CWE-ID	CWE-400 CWE-295
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Go programming language Universal components / Libraries / Scripting languages
Vendor	Google

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Resource exhaustion

EUVDB-ID: #VU119235

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-61729

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources within the HostnameError.Error() function in crypto/x509 when printing error string for host certificate validation. A remote attacker can supply a specially crafted certificate to the application and trigger resource exhaustion, leading to a denial of service condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Go programming language: 1.24 rc1 - 1.25.4

CPE2.3

External links

https://groups.google.com/g/golang-announce/c/8FJoBkPddm4
https://go.dev/issue/76445

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Improper certificate validation

EUVDB-ID: #VU119236

Risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-61727

CWE-ID: CWE-295 - Improper Certificate Validation