{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/65239?format=json","vulnerability_id":"VCID-uqng-ft4x-3ydj","summary":"cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. This CVE covers quadratic complexity issues when parsing text which leads with either large numbers of `_` characters. This issue has been addressed in version 0.29.0.gfm.10. Users are advised to upgrade. Users unable to upgrade should validate that their input comes from trusted sources.     ### Impact  A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service.  ### Proof of concept  ``` $ ~/cmark-gfm$ python3 -c 'pad = \"_\" * 100000; print(pad + \".\" + pad, end=\"\")' | time ./build/src/cmark-gfm --to plaintext ```  Increasing the number 10000 in the above commands causes the running time to increase quadratically.  ### Patches  This vulnerability have been patched in 0.29.0.gfm.10.  ### Note on cmark and cmark-gfm  XXX: TBD  [cmark-gfm](https://github.com/github/cmark-gfm) is a fork of [cmark](https://github.com/commonmark/cmark) that adds the GitHub Flavored Markdown extensions. The two codebases have diverged over time, but share a common core. These bugs affect both `cmark` and `cmark-gfm`.   ### Credit  We would like to thank @gravypod for reporting this vulnerability.  ### References  https://en.wikipedia.org/wiki/Time_complexity  ### For more information  If you have any questions or comments about this advisory:  * Open an issue in [github/cmark-gfm](https://github.com/github/cmark-gfm)","aliases":[{"alias":"CVE-2023-26485"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/91716?format=json","purl":"pkg:deb/debian/cmark-gfm@0.29.0.gfm.13-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/cmark-gfm@0.29.0.gfm.13-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/509804?format=json","purl":"pkg:deb/debian/cmark-gfm@0.29.0.gfm.13-4","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/cmark-gfm@0.29.0.gfm.13-4"},{"url":"http://public2.vulnerablecode.io/api/packages/91713?format=json","purl":"pkg:deb/debian/cmark-gfm@0.29.0.gfm.13-4?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/cmark-gfm@0.29.0.gfm.13-4%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/91712?format=json","purl":"pkg:deb/debian/cmark-gfm@0.29.0.gfm.13-7.1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/cmark-gfm@0.29.0.gfm.13-7.1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/509999?format=json","purl":"pkg:deb/debian/python-cmarkgfm@2024.11.20-1","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/python-cmarkgfm@2024.11.20-1"},{"url":"http://public2.vulnerablecode.io/api/packages/124751?format=json","purl":"pkg:deb/debian/python-cmarkgfm@2024.11.20-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/python-cmarkgfm@2024.11.20-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/124750?format=json","purl":"pkg:deb/debian/python-cmarkgfm@2025.10.22-2?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/python-cmarkgfm@2025.10.22-2%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/126309?format=json","purl":"pkg:deb/debian/r-cran-commonmark@1.9.1-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/r-cran-commonmark@1.9.1-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/195897?format=json","purl":"pkg:deb/debian/r-cran-commonmark@1.9.5-1","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/r-cran-commonmark@1.9.5-1"},{"url":"http://public2.vulnerablecode.io/api/packages/126302?format=json","purl":"pkg:deb/debian/r-cran-commonmark@1.9.5-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/r-cran-commonmark@1.9.5-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/126301?format=json","purl":"pkg:deb/debian/r-cran-commonmark@2.0.0-2?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/r-cran-commonmark@2.0.0-2%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/127301?format=json","purl":"pkg:deb/debian/ruby-commonmarker@0.23.10-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/ruby-commonmarker@0.23.10-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/196360?format=json","purl":"pkg:deb/debian/ruby-commonmarker@0.23.10-1","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/ruby-commonmarker@0.23.10-1"}],"affected_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/196286?format=json","purl":"pkg:deb/debian/cmark-gfm@0.29.0.gfm.0-6","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-1z6r-htju-wkhp"},{"vulnerability":"VCID-22uj-nmkk-jbfr"},{"vulnerability":"VCID-29sg-t6ye-2kbh"},{"vulnerability":"VCID-4d5b-yhjq-7ka7"},{"vulnerability":"VCID-7s8k-utv9-1qfs"},{"vulnerability":"VCID-brhv-976k-sbhe"},{"vulnerability":"VCID-gkxf-yuu8-gyfg"},{"vulnerability":"VCID-p384-h1h3-z7bt"},{"vulnerability":"VCID-uqng-ft4x-3ydj"},{"vulnerability":"VCID-uw1x-u1gn-2yd1"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/cmark-gfm@0.29.0.gfm.0-6"},{"url":"http://public2.vulnerablecode.io/api/packages/91709?format=json","purl":"pkg:deb/debian/cmark-gfm@0.29.0.gfm.0-6?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-1z6r-htju-wkhp"},{"vulnerability":"VCID-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