CVE-2026-73294 Semaphore U: OS Command Injection
A project Manager or Owner can execute arbitrary OS commands on the Semaphore server by manipulating the git_url field in repository settings.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-73294?
CVE-2026-73294 is a critical command injection vulnerability in semaphoreui semaphore, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Semaphore UI is a web interface for managing DevOps tools. Prior to 2.18.17 and 2.19.5-beta2, repository git_url handling passes an attacker-controlled --upload-pack option to CmdGitClient.GetLastRemoteCommitHash through POST /api/project/{id}/repositories and scheduled commit-hash polling, allowing a project Manager or Owner to execute arbitrary OS commands in the Semaphore server process. This issue is fixed in versions 2.18.17 and 2.19.5-beta2.
Which versions are affected by CVE-2026-73294?
How do I fix CVE-2026-73294?
Upgrade to a fixed version.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-73294 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73294 exists.