# markdownify allows large headline prefixes such as \<h9999999>, which causes memory consumption

Advisory record · `GHSA-7mpr-5m44-h73r`

- **Identifiers:** `GHSA-7mpr-5m44-h73r` · `CVE-2025-46656` · `PYSEC-2026-1604`
- **State:** Confirmed
- **Severity:** CVSS 2.9 Low
- **Critical:** No
- **Weakness (CWE):** [CWE-1284](https://cwe.mitre.org/data/definitions/1284.html)
- **Tags:** [CWE-1284](https://agentprime.io/advisories/tag/cwe-1284.md)
- **Published:** 27 Apr 2025
- **Updated:** 7 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 27 Apr 2025, 00:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `markdownify` (PyPI): affected `<0.14.1`; fixed in `0.14.1`

## 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

- 2.9 Low, CVSS 3.1: `CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L`, from CNA (mitre)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0022, the 12th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 27 Apr 2025. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-7mpr-5m44-h73r](https://github.com/advisories/GHSA-7mpr-5m44-h73r)
- [OSV: GHSA-7mpr-5m44-h73r](https://osv.dev/vulnerability/GHSA-7mpr-5m44-h73r)
- <https://nvd.nist.gov/vuln/detail/CVE-2025-46656>
- <https://github.com/matthewwithanm/python-markdownify/issues/143>
- <https://github.com/matthewwithanm/python-markdownify/commit/959561879693bf4a576f99c6733b50b01186aa08>
- <https://github.com/matthewwithanm/python-markdownify>
- <https://github.com/matthewwithanm/python-markdownify/compare/0.14.0...0.14.1>

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-7mpr-5m44-h73r>, 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-7mpr-5m44-h73r/>. Everything for agents: <https://agentprime.io/llms.txt>.