cmd-go up to 1.25.9/1.26.2 on Go /tmp temp file

Summaryinfo

A vulnerability was found in cmd-go up to 1.25.9/1.26.2 on Go and classified as critical. This affects an unknown part of the file /tmp. Such manipulation leads to temp file. This vulnerability is documented as CVE-2026-39819. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in cmd-go up to 1.25.9/1.26.2 on Go. Affected by this issue is an unknown code of the file /tmp. The manipulation with an unknown input leads to a temp file vulnerability. Using CWE to declare the problem leads to CWE-377. Creating and using insecure temporary files can leave application and system data vulnerable to attack. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink.

The advisory is available at go.dev. This vulnerability is handled as CVE-2026-39819 since 04/07/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 313237 (Linux Distros Unpatched Vulnerability : CVE-2026-39819), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.25.10 or 1.26.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (313237), EUVD (EUVD-2026-28422) and CERT Bund (WID-SEC-2026-1437). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Splunk Splunk Enterprise
• Red Hat Enterprise Linux
• Google Container-Optimized OS
• Amazon Linux 2
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Microsoft Azure Linux
• Golang Go
• Red Hat OpenShift

Productinfo

Name

• cmd-go

Version

• 1.25.0
• 1.25.1
• 1.25.2
• 1.25.3
• 1.25.4
• 1.25.5
• 1.25.6
• 1.25.7
• 1.25.8
• 1.25.9
• 1.26.0
• 1.26.1
• 1.26.2

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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