SB2025120604 - Multiple vulnerabilities in Go programming language

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Resource exhaustion (CVE-ID: CVE-2025-61729)

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. 

2) Improper certificate validation (CVE-ID: CVE-2025-61727)

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists in crypto/x509 due to incorrect handling of wildcard SANs in the leaf certificate when processing excluded constraint in a certificate chain. A remote attacker can create a specially crafted certificate and bypass implemented domain restrictions and perform MitM or phishing attacks.

Remediation

Install update from vendor's website.

References

• https://groups.google.com/g/golang-announce/c/8FJoBkPddm4
• https://go.dev/issue/76445
• https://go.dev/issue/76442