{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2023-26485", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2023-02-23T23:22:58.575Z", "datePublished": "2023-03-31T22:01:16.350Z", "dateUpdated": "2025-02-11T17:20:37.921Z"}, "containers": {"cna": {"title": "Quadratic complexity may lead to a denial of service in cmark-gfm", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-407", "lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5"}, {"name": "https://github.com/github/cmark-gfm/commit/07a66c9bc341f902878e37d7da8647d6ef150987", "tags": ["x_refsource_MISC"], "url": "https://github.com/github/cmark-gfm/commit/07a66c9bc341f902878e37d7da8647d6ef150987"}], "affected": [{"vendor": "github", "product": "cmark-gfm", "versions": [{"version": "< 0.29.0.gfm.10", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2023-03-31T22:01:16.350Z"}, "descriptions": [{"lang": "en", "value": "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.\n\n\n\n\n### Impact\n\nA polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service.\n\n### Proof of concept\n\n```\n$ ~/cmark-gfm$ python3 -c 'pad = \"_\" * 100000; print(pad + \".\" + pad, end=\"\")' | time ./build/src/cmark-gfm --to plaintext\n```\n\nIncreasing the number 10000 in the above commands causes the running time to increase quadratically.\n\n### Patches\n\nThis vulnerability have been patched in 0.29.0.gfm.10.\n\n### Note on cmark and cmark-gfm\n\nXXX: TBD\n\n[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`. \n\n### Credit\n\nWe would like to thank @gravypod for reporting this vulnerability.\n\n### References\n\nhttps://en.wikipedia.org/wiki/Time_complexity\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Open an issue in [github/cmark-gfm](https://github.com/github/cmark-gfm)\n"}], "source": {"advisory": "GHSA-r8vr-c48j-fcc5", "discovery": "UNKNOWN"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T11:53:52.747Z"}, "title": "CVE Program Container", "references": [{"name": "https://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5", "tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5"}, {"name": "https://github.com/github/cmark-gfm/commit/07a66c9bc341f902878e37d7da8647d6ef150987", "tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/github/cmark-gfm/commit/07a66c9bc341f902878e37d7da8647d6ef150987"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-02-11T17:20:05.803675Z", "id": "CVE-2023-26485", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-11T17:20:37.921Z"}}]}}

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{"bugzilla": {"description": "commonmarker: Quadratic complexity bug may lead to a denial of service", "id": "2210173", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2210173"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "(CWE-400|CWE-407)", "details": ["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.\n### Impact\nA polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service.\n### Proof of concept\n```\n$ ~/cmark-gfm$ python3 -c 'pad = \"_\" * 100000; print(pad + \".\" + pad, end=\"\")' | time ./build/src/cmark-gfm --to plaintext\n```\nIncreasing the number 10000 in the above commands causes the running time to increase quadratically.\n### Patches\nThis vulnerability have been patched in 0.29.0.gfm.10.\n### Note on cmark and cmark-gfm\nXXX: TBD\n[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`. \n### Credit\nWe would like to thank @gravypod for reporting this vulnerability.\n### References\nhttps://en.wikipedia.org/wiki/Time_complexity\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [github/cmark-gfm](https://github.com/github/cmark-gfm)", "A flaw was found in CommonMarker. A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service."], "name": "CVE-2023-26485", "package_state": [{"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Affected", "package_name": "commonmarker", "product_name": "Red Hat 3scale API Management Platform 2"}], "public_date": "2023-04-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-26485\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-26485\nhttps://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5"], "threat_severity": "Moderate"}

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