CVE-2026-5366 Git Argument Injection in prefecthq/prefect
Attackers with deployment permissions can execute arbitrary commands on worker machines by injecting git flags into Prefect storage parameters.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5366?
CVE-2026-5366 is a critical command injection vulnerability in prefecthq/prefect, published on 20 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Prefect version 3.6.23 is vulnerable to remote code execution due to improper handling of user-controlled input in the `GitRepository` storage class. The `commit_sha` parameter, which is passed to git commands, lacks validation and does not include a `--` separator to distinguish user input from git flags. This allows attackers to inject arbitrary git flags, such as `--upload-pack`, enabling execution of external programs. Additionally, the `directories` parameter can be exploited to inject git flags during sparse-checkout operations. These vulnerabilities allow any user with deployment creation permissions to execute arbitrary commands on worker machines, compromising shared work pools in multi-tenant environments.
Weakness: CWE-94
Which versions are affected by CVE-2026-5366?
It affects 1 product.
Products include Prefect Prefect.
How do I fix CVE-2026-5366?
No fix has been published for CVE-2026-5366 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-5366 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5366 exists.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in prefecthq/prefect
Sources
Also known as GHSA-7pm4-56h2-5rxr.