Vulnerability Instance
Lookup for vulnerabilities affecting packages.
GET /api/vulnerabilities/65239?format=api
{ "url": "http://public2.vulnerablecode.io/api/vulnerabilities/65239?format=api", "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=api", "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=api", "purl": "pkg:deb/debian/cmark-gfm@0.29.0.gfm.13-4", "is_vulnerable": false, "affected_by_vulnerabilities": [], "resource_url": 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"http://public2.vulnerablecode.io/packages/pkg:deb/debian/python-cmarkgfm@2024.11.20-1" }, { "url": "http://public2.vulnerablecode.io/api/packages/124751?format=api", "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=api", "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=api", "purl": "pkg:deb/debian/r-cran-commonmark@1.9.1-1?distro=trixie", "is_vulnerable": false, "affected_by_vulnerabilities": [], "resource_url": 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"https://api.first.org/data/v1/epss?cve=CVE-2023-26485" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-26485", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-26485" }, { "reference_url": "https://github.com/github/cmark-gfm/commit/07a66c9bc341f902878e37d7da8647d6ef150987", "reference_id": "07a66c9bc341f902878e37d7da8647d6ef150987", "reference_type": "", "scores": [ { "value": "5.3", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2025-02-11T17:20:05Z/" } ], "url": "https://github.com/github/cmark-gfm/commit/07a66c9bc341f902878e37d7da8647d6ef150987" }, { "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034171", "reference_id": "1034171", "reference_type": "", "scores": [], "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034171" }, { "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034172", "reference_id": "1034172", "reference_type": "", "scores": [], "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034172" }, { "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034173", "reference_id": "1034173", "reference_type": "", "scores": [], "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034173" }, { "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034174", "reference_id": "1034174", "reference_type": "", "scores": [], "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034174" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=2210173", "reference_id": "2210173", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2210173" }, { "reference_url": "https://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5", "reference_id": "GHSA-r8vr-c48j-fcc5", "reference_type": "", "scores": [ { "value": "5.3", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2025-02-11T17:20:05Z/" } ], "url": "https://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5" }, { "reference_url": "https://usn.ubuntu.com/7319-1/", "reference_id": "USN-7319-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/7319-1/" } ], "weaknesses": [ { "cwe_id": 1333, "name": "Inefficient Regular Expression Complexity", "description": "The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles." }, { "cwe_id": 400, "name": "Uncontrolled Resource Consumption", "description": "The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources." }, { "cwe_id": 407, "name": "Inefficient Algorithmic Complexity", "description": "An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached." } ], "exploits": [], "severity_range_score": "5.3 - 7.5", "exploitability": "0.5", "weighted_severity": "6.8", "risk_score": 3.4, "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-uqng-ft4x-3ydj" }