CVE-2025-68119

A flaw was found in Golang's cmd/go module. This vulnerability allows a local attacker to achieve local code execution by downloading and building modules with specially crafted malicious version strings. On systems with Mercurial (hg) installed, this can occur when downloading modules from non-standard sources due to how external Version Control System (VCS) commands are constructed. Additionally, on systems with Git installed, providing malicious version strings to the toolchain can enable an attacker to write to arbitrary files on the filesystem. This issue is triggered by explicitly supplying these malicious version strings.

This issue is rated Moderate severity by Red Hat Product Security, because exploitation requires non-standard and intentional user behavior.

The attacker must explicitly supply a specially crafted module version string, which does not occur during normal Go module usage such as @latest or standard module paths, making the attack complexity high.

Additionally, user interaction is required, as the vulnerable behavior is only triggered when a user manually invokes the Go toolchain to download or build the malicious module.

While successful exploitation can result in local code execution or arbitrary file modification, the combination of local access, manual input, and uncommon usage patterns significantly limits the likelihood of exploitation in typical environments.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.