# CVE-2022-21670: node-markdown-it: markdown-it is a Markdown parser

CVE-2022-21670 is fixed in node-markdown-it on 1 platform, first by DEBIAN-CVE-2022-21670, released January 10, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-21670
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0236
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 10, 2022

## Description

markdown-it is a Markdown parser. Prior to version 1.3.2, special patterns with length greater than 50 thousand characterss could slow down the parser significantly. Users should upgrade to version 12.3.2 to receive a patch. There are no known workarounds aside from upgrading.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-markdown-it Debian 12.15 (bookworm) | 10.0.0+dfsg-6 | [DEBIAN-CVE-2022-21670](https://patchblox.com/security/data/fix/linux/debian-cve-2022-21670.md) | Jan 10, 2022 |
| Linux | node-markdown-it Debian 13.5 (trixie) | 10.0.0+dfsg-6 | [DEBIAN-CVE-2022-21670](https://patchblox.com/security/data/fix/linux/debian-cve-2022-21670.md) | Jan 10, 2022 |
| Linux | node-markdown-it Debian 14 | 10.0.0+dfsg-6 | [DEBIAN-CVE-2022-21670](https://patchblox.com/security/data/fix/linux/debian-cve-2022-21670.md) | Jan 10, 2022 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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