# Prefect has an Argument Injection issue

Advisory record · `GHSA-cw25-2p92-7f75`

- **Identifiers:** `GHSA-cw25-2p92-7f75` · `CVE-2026-3515` · `PYSEC-2026-2957`
- **State:** Confirmed
- **Severity:** CVSS 8.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-88](https://cwe.mitre.org/data/definitions/88.html)
- **Tags:** [Command injection](https://agentprime.io/advisories/tag/command-injection.md)
- **Published:** 26 May 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 26 May 2026, 13:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `prefect` (PyPI): affected `<=3.6.18`; no fixed version yet

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Prefect (versions up to and including 3.6.18) is affected by an argument injection flaw in the GitHubRepository block of the prefect-github integration. An attacker who can control the reference field can inject arbitrary git command-line options, which can lead to server-side request forgery, credential theft, or remote code execution. No fixed version is listed.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.5 High, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N`, from CNA (@huntr_ai)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0030, the 22nd percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:11 UTC: First seen by agentprime
- 31 Oct 2026, 14:11 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-cw25-2p92-7f75)

## Sources

- [GitHub Advisory Database: GHSA-cw25-2p92-7f75](https://github.com/advisories/GHSA-cw25-2p92-7f75)
- [OSV: GHSA-cw25-2p92-7f75](https://osv.dev/vulnerability/GHSA-cw25-2p92-7f75)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-3515>
- <https://github.com/PrefectHQ/prefect>
- <https://huntr.com/bounties/f3b048b8-7f4e-45ef-a5a7-cb841c39acde>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-cw25-2p92-7f75>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-cw25-2p92-7f75/>. Everything for agents: <https://agentprime.io/llms.txt>.