Vulnerability · Published May 24, 2026 · Assigned by @huntr_ai
CVE-2026-3515Argument Injection in prefecthq/prefect
High 8.5
In plain English
A high-severity argument injection in prefecthq/prefect from prefecthq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Official description
A vulnerability in the `GitHubRepository` block of the `prefect-github` integration in Prefect version 3.6.18 allows an attacker to inject arbitrary git command-line options via the `reference` field. The `reference` field is concatenated directly into a `git clone` command string without proper sanitization, and then parsed by `shlex.split()`. This enables injection of options such as `-c`, leading to potential Server-Side Request Forgery (SSRF), credential theft, or remote code execution (RCE). The vulnerability affects both the `aget_directory()` and `get_directory()` methods in `src/integrations/prefect-github/prefect_github/repository.py`. This issue does not affect the GitLab and BitBucket integrations, which use a safer list-based command construction approach.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | prefect | no fix listed | GHSA-cw25-2p92-7f75 |
| PyPI | prefect | no fix listed | PYSEC-2026-2957 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| prefecthq | prefecthq/prefect | unspecified – through latest |
Weakness: CWE-88 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N