CVE-2023-42821

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{"affected": [{"affectedData": [{"product": "markdown", "vendor": "gomarkdown", "versions": [{"status": "affected", "version": "< 0.0.0-20230922105210-14b16010c2ee"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:gomarkdown:markdown:-:*:*:*:*:go:*:*", "matchCriteriaId": "0982DB0A-C064-4EEE-814A-730F890C5F6F", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue."}, {"lang": "es", "value": "El paquete `github.com/gomarkdown/markdown` es una liber\u00eda Go para analizar texto Markdown y representarlo como HTML. Antes de la pseudoversi\u00f3n `0.0.0-20230922105210-14b16010c2ee`, que corresponde con el commit `14b16010c2ee7ff33a940a541d993bd043a88940`, analizando el markdown con formato incorrecto con un analizador que utiliza la extensi\u00f3n parser.Mmark podr\u00eda resultar en una vulnerabilidad de lectura fuera de los l\u00edmites. Para explotar la vulnerabilidad, el analizador debe tener configurada la extensi\u00f3n `parser.Mmark`. El p\u00e1nico ocurre dentro del archivo `citation.go` en la l\u00ednea 69 cuando el analizador intenta acceder al elemento m\u00e1s all\u00e1 de su longitud. Esto puede resultar en una denegaci\u00f3n de servicio. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contiene un parche para este problema."}], "id": "CVE-2023-42821", "lastModified": "2026-06-17T06:24:35.577", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "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:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "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:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-42821", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-24T19:26:08.128213Z", "version": "2.0.3"}}]}, "published": "2023-09-22T17:15:14.990", "references": [{"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Product"], "url": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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