# Denial of service could be caused to the command line interface of markdown-it-py, before v2.2.0, if an attacker was allowed to use invalid UTF-8 characters as input.

Advisory record · `GHSA-jrwr-5x3p-hvc3`

- **Identifiers:** `GHSA-jrwr-5x3p-hvc3` · `CVE-2023-26302` · `PYSEC-2023-23`
- **State:** Confirmed
- **Severity:** CVSS 3.3 Low
- **Critical:** No
- **Weakness (CWE):** [CWE-173](https://cwe.mitre.org/data/definitions/173.html)
- **Tags:** [CWE-173](https://agentprime.io/advisories/tag/cwe-173.md)
- **Published:** 22 Feb 2023
- **Updated:** 10 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 22 Feb 2023, 23:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `markdown-it-py` (PyPI): affected `<53ca3e9c2b9e9b295f6abf7f4ad2730a9b70f68c || <2.2.0`; fixed in `53ca3e9c2b9e9b295f6abf7f4ad2730a9b70f68c`, `2.2.0`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0022, the 13th percentile, on 6 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 22 Feb 2023. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-jrwr-5x3p-hvc3](https://github.com/advisories/GHSA-jrwr-5x3p-hvc3)
- [OSV: GHSA-jrwr-5x3p-hvc3](https://osv.dev/vulnerability/GHSA-jrwr-5x3p-hvc3)
- <https://github.com/executablebooks/markdown-it-py/commit/53ca3e9c2b9e9b295f6abf7f4ad2730a9b70f68c>
- <https://github.com/advisories/GHSA-jrwr-5x3p-hvc3>

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-jrwr-5x3p-hvc3>, 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-jrwr-5x3p-hvc3/>. Everything for agents: <https://agentprime.io/llms.txt>.