Vulnerability · Published Jun 20, 2026 · Assigned by @huntr_ai
CVE-2026-5366Git Argument Injection in prefecthq/prefect
Critical 9.9
In plain English
A critical-severity code injection in prefecthq/prefect from prefecthq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | prefect | 3.6.25 | GHSA-7pm4-56h2-5rxr |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| prefecthq | prefecthq/prefect | unspecified – through latest |
Weakness: CWE-94 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H