# CVE-2022-39209: cmark-gfm: cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C

CVE-2022-39209 is fixed in 9 products on 1 platform, first by DEBIAN-CVE-2022-39209, released September 15, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-39209
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0215
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 15, 2022

## Description

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior to 0.29.0.gfm.6 a polynomial time complexity issue in cmark-gfm's autolink extension may lead to unbounded resource exhaustion and subsequent denial of service. Users may verify the patch by running `python3 -c 'print("![l"* 100000 + "\n")' | ./cmark-gfm -e autolink`, which will resource exhaust on unpatched cmark-gfm but render correctly on patched cmark-gfm. This vulnerability has been patched in 0.29.0.gfm.6. Users are advised to upgrade. Users unable to upgrade should disable the use of the autolink extension.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | cmark-gfm Debian 12.15 (bookworm) | 0.29.0.gfm.6-2 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | cmark-gfm Debian 13.5 (trixie) | 0.29.0.gfm.6-2 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | cmark-gfm Debian 14 | 0.29.0.gfm.6-2 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | cmark-gfm Ubuntu 20.04 LTS (focal) | 0.29.0.gfm.0-4ubuntu0.1~esm1 | [cmark-gfm 0.29.0.gfm.0-4ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-cmark-gfm-0.29.0.gfm.0-4ubuntu0.1-esm1.md) | Mar 31, 2023 |
| Linux | cmark-gfm Ubuntu 22.04.1 LTS (jammy) | 0.29.0.gfm.3-3ubuntu0.1~esm1 | [cmark-gfm 0.29.0.gfm.3-3ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-cmark-gfm-0.29.0.gfm.3-3ubuntu0.1-esm1.md) | Mar 31, 2023 |
| Linux | ghostwriter Debian 12.15 (bookworm) | 2.1.6+ds-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | ghostwriter Debian 13.5 (trixie) | 2.1.6+ds-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | ghostwriter Debian 14 | 2.1.6+ds-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | libcmark-gfm-extensions0 Ubuntu 20.04 LTS (focal) | 0.29.0.gfm.0-4ubuntu0.1~esm1 | [libcmark-gfm-extensions0 0.29.0.gfm.0-4ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcmark-gfm-extensions0-0.29.0.gfm.0-4ubuntu0.1-esm1.md) | Mar 31, 2023 |
| Linux | libcmark-gfm-extensions0.29.0.gfm.3 Ubuntu 22.04.1 LTS (jammy) | 0.29.0.gfm.3-3ubuntu0.1~esm1 | [libcmark-gfm-extensions0.29.0.gfm.3 0.29.0.gfm.3-3ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcmark-gfm-extensions0.29.0.gfm.3-0.29.0.gfm.3-3ubuntu0.1-esm1.md) | Mar 31, 2023 |
| Linux | libcmark-gfm0 Ubuntu 20.04 LTS (focal) | 0.29.0.gfm.0-4ubuntu0.1~esm1 | [libcmark-gfm0 0.29.0.gfm.0-4ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcmark-gfm0-0.29.0.gfm.0-4ubuntu0.1-esm1.md) | Mar 31, 2023 |
| Linux | libcmark-gfm0.29.0.gfm.3 Ubuntu 22.04.1 LTS (jammy) | 0.29.0.gfm.3-3ubuntu0.1~esm1 | [libcmark-gfm0.29.0.gfm.3 0.29.0.gfm.3-3ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcmark-gfm0.29.0.gfm.3-0.29.0.gfm.3-3ubuntu0.1-esm1.md) | Mar 31, 2023 |
| Linux | python-cmarkgfm Debian 13.5 (trixie) | 2024.11.20-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | python-cmarkgfm Debian 14 | 2024.11.20-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | r-cran-commonmark Debian 12.15 (bookworm) | 1.8.1-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | r-cran-commonmark Debian 13.5 (trixie) | 1.8.1-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | r-cran-commonmark Debian 14 | 1.8.1-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | ruby-commonmarker Debian 13.5 (trixie) | 0.23.10-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |
| Linux | ruby-commonmarker Debian 14 | 0.23.10-1 | [DEBIAN-CVE-2022-39209](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39209.md) | Sep 15, 2022 |

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