# CVE-2023-22486: cmark-gfm: cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and renderinglibrary and program in C CVE-2023-22486 is fixed in 10 products on 1 platform, first by DEBIAN-CVE-2023-22486, released January 26, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-22486 - Priority: High - CVSS: 7.5 (Medium) - EPSS: 0.0112 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jan 26, 2023 ## Description cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and renderinglibrary and program in C. Versions prior to 0.29.0.gfm.7 contain apolynomial time complexity issue in handle_close_bracket that may lead tounbounded resource exhaustion and subsequent denial of service. Thisvulnerability has been patched in 0.29.0.gfm.7. ## 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-2023-22486](https://patchblox.com/security/data/fix/linux/debian-cve-2023-22486.md) | Jan 26, 2023 | | Linux | cmark-gfm Debian 14 | 0.29.0.gfm.13-1 | [DEBIAN-CVE-2023-22486](https://patchblox.com/security/data/fix/linux/debian-cve-2023-22486.md) | Jan 26, 2023 | | 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 | cmark-gfm Ubuntu 24.04.5 LTS (noble) | 0.29.0.gfm.6-6ubuntu0.24.04.1~esm1 | [cmark-gfm 0.29.0.gfm.6-6ubuntu0.24.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-cmark-gfm-0.29.0.gfm.6-6ubuntu0.24.04.1-esm1.md) | Mar 31, 2023 | | Linux | cmark-gfm Ubuntu 24.10 (oracular) | 0.29.0.gfm.6-6ubuntu0.24.10.1 | [cmark-gfm 0.29.0.gfm.6-6ubuntu0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-cmark-gfm-0.29.0.gfm.6-6ubuntu0.24.10.1.md) | Jan 16, 2026 | | 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-gfm-extensions0.29.0.gfm.6 Ubuntu 24.04.5 LTS (noble) | 0.29.0.gfm.6-6ubuntu0.24.04.1~esm1 | [libcmark-gfm-extensions0.29.0.gfm.6 0.29.0.gfm.6-6ubuntu0.24.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcmark-gfm-extensions0.29.0.gfm.6-0.29.0.gfm.6-6ubuntu0.24.04.1-esm1.md) | Mar 31, 2023 | | Linux | libcmark-gfm-extensions0.29.0.gfm.6 Ubuntu 24.10 (oracular) | 0.29.0.gfm.6-6ubuntu0.24.10.1 | [libcmark-gfm-extensions0.29.0.gfm.6 0.29.0.gfm.6-6ubuntu0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libcmark-gfm-extensions0.29.0.gfm.6-0.29.0.gfm.6-6ubuntu0.24.10.1.md) | Jan 16, 2026 | | 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 | libcmark-gfm0.29.0.gfm.6 Ubuntu 24.04.5 LTS (noble) | 0.29.0.gfm.6-6ubuntu0.24.04.1~esm1 | [libcmark-gfm0.29.0.gfm.6 0.29.0.gfm.6-6ubuntu0.24.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcmark-gfm0.29.0.gfm.6-0.29.0.gfm.6-6ubuntu0.24.04.1-esm1.md) | Mar 31, 2023 | | Linux | libcmark-gfm0.29.0.gfm.6 Ubuntu 24.10 (oracular) | 0.29.0.gfm.6-6ubuntu0.24.10.1 | [libcmark-gfm0.29.0.gfm.6 0.29.0.gfm.6-6ubuntu0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libcmark-gfm0.29.0.gfm.6-0.29.0.gfm.6-6ubuntu0.24.10.1.md) | Jan 16, 2026 | | Linux | python-cmarkgfm Debian 13.5 (trixie) | 2024.11.20-1 | [DEBIAN-CVE-2023-22486](https://patchblox.com/security/data/fix/linux/debian-cve-2023-22486.md) | Jan 26, 2023 | | Linux | python-cmarkgfm Debian 14 | 2024.11.20-1 | [DEBIAN-CVE-2023-22486](https://patchblox.com/security/data/fix/linux/debian-cve-2023-22486.md) | Jan 26, 2023 | | Linux | r-cran-commonmark Debian 13.5 (trixie) | 1.9.0-1 | [DEBIAN-CVE-2023-22486](https://patchblox.com/security/data/fix/linux/debian-cve-2023-22486.md) | Jan 26, 2023 | | Linux | r-cran-commonmark Debian 14 | 1.9.0-1 | [DEBIAN-CVE-2023-22486](https://patchblox.com/security/data/fix/linux/debian-cve-2023-22486.md) | Jan 26, 2023 | | Linux | ruby-commonmarker Debian 13.5 (trixie) | 0.23.10-1 | [DEBIAN-CVE-2023-22486](https://patchblox.com/security/data/fix/linux/debian-cve-2023-22486.md) | Jan 26, 2023 | | Linux | ruby-commonmarker Debian 14 | 0.23.10-1 | [DEBIAN-CVE-2023-22486](https://patchblox.com/security/data/fix/linux/debian-cve-2023-22486.md) | Jan 26, 2023 | --- Data as of 2026-11-08T13:06:02Z UTC. 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