# CVE-2023-37463: cmark-gfm: cmark-gfm is an extended version of the C reference implementation of CommonMark, a rationalized version of Markdown...

CVE-2023-37463 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2023-37463, released July 13, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-37463
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0070
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 13, 2023

## Description

cmark-gfm is an extended version of the C reference implementation of CommonMark, a rationalized version of Markdown syntax with a spec. Three polynomial time complexity issues in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. These vulnerabilities have been patched in 0.29.0.gfm.12.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | cmark-gfm Debian 13.5 (trixie) | 0.29.0.gfm.13-1 | [DEBIAN-CVE-2023-37463](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37463.md) | Jul 13, 2023 |
| Linux | cmark-gfm Debian 14 | 0.29.0.gfm.13-1 | [DEBIAN-CVE-2023-37463](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37463.md) | Jul 13, 2023 |
| Linux | python-cmarkgfm Debian 13.5 (trixie) | 2024.11.20-1 | [DEBIAN-CVE-2023-37463](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37463.md) | Jul 13, 2023 |
| Linux | python-cmarkgfm Debian 14 | 2024.11.20-1 | [DEBIAN-CVE-2023-37463](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37463.md) | Jul 13, 2023 |
| Linux | r-cran-commonmark Debian 13.5 (trixie) | 1.9.1-1 | [DEBIAN-CVE-2023-37463](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37463.md) | Jul 13, 2023 |
| Linux | r-cran-commonmark Debian 14 | 1.9.1-1 | [DEBIAN-CVE-2023-37463](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37463.md) | Jul 13, 2023 |
| Linux | ruby-commonmarker Debian 13.5 (trixie) | 0.23.10-1 | [DEBIAN-CVE-2023-37463](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37463.md) | Jul 13, 2023 |
| Linux | ruby-commonmarker Debian 14 | 0.23.10-1 | [DEBIAN-CVE-2023-37463](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37463.md) | Jul 13, 2023 |

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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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