# Dag Authors, who normally should not be able to execute code in the webserver context could craft XCom payload causing the webserver to execute arbitrary code. Since Dag Authors are already highly ...

Advisory record · `GHSA-mc4f-r875-v87w`

- **Identifiers:** `GHSA-mc4f-r875-v87w` · `BIT-airflow-2026-33858` · `CVE-2026-33858` · `PYSEC-2026-20`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **Weakness (CWE):** [CWE-502](https://cwe.mitre.org/data/definitions/502.html)
- **Tags:** [Insecure deserialization](https://agentprime.io/advisories/tag/deserialization.md)
- **Published:** 13 Apr 2026
- **Updated:** 10 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 13 Apr 2026, 15:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `apache-airflow` (PyPI): affected `>=3.1.8, <3.2.0`; fixed in `3.2.0`

## Machine-written summary

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

> Apache Airflow versions 3.1.8 up to but not including 3.2.0 are affected. A Dag Author, who is normally not allowed to run code in the webserver context, can craft an XCom payload that causes the webserver to execute arbitrary code. Users should upgrade to Apache Airflow 3.2.0.

Written 10 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

- 8.8 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from OSV

- **CISA KEV:** Not listed.
- **EPSS:** 0.0060, the 49th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 13 Apr 2026, 14:36 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-33858)
- 13 Apr 2026, 15:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-33858)

## Sources

- [GitHub Advisory Database: GHSA-mc4f-r875-v87w](https://github.com/advisories/GHSA-mc4f-r875-v87w)
- [OSV: GHSA-mc4f-r875-v87w](https://osv.dev/vulnerability/GHSA-mc4f-r875-v87w)
- <http://www.openwall.com/lists/oss-security/2026/04/13/7>
- <https://lists.apache.org/thread/1npt3o2x81s0gw9tmfcv4n7p1z9hdmy0>
- <https://github.com/advisories/GHSA-mc4f-r875-v87w>

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-mc4f-r875-v87w>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-mc4f-r875-v87w/>. Everything for agents: <https://agentprime.io/llms.txt>.