CVE-2026-59922

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59922", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-07T18:20:06.125Z", "datePublished": "2026-07-08T16:12:00.545Z", "dateUpdated": "2026-07-09T14:40:22.315Z"}, "containers": {"cna": {"title": "Mistune plugins/formatting: quadratic-time parsing on long runs of `~~x~~`, `==x==`, and `^^x^^` markers (strikethrough / mark / insert)", "problemTypes": [{"descriptions": [{"cweId": "CWE-407", "lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-1333", "lang": "en", "description": "CWE-1333: Inefficient Regular Expression Complexity", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"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"}}], "references": [{"name": "https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq"}, {"name": "https://github.com/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7", "tags": ["x_refsource_MISC"], "url": "https://github.com/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7"}, {"name": "https://github.com/lepture/mistune/releases/tag/v3.3.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/lepture/mistune/releases/tag/v3.3.0"}], "affected": [{"vendor": "lepture", "product": "mistune", "versions": [{"version": "< 3.3.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T16:12:00.545Z"}, "descriptions": [{"lang": "en", "value": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0."}], "source": {"advisory": "GHSA-c8j7-8cv4-2xmq", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-09T14:39:49.792478Z", "id": "CVE-2026-59922", "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": "2026-07-09T14:40:22.315Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-59922", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-09T14:39:49.792478Z"}}}], "references": [{"url": "https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-09T14:39:58.007Z"}}], "cna": {"title": "Mistune plugins/formatting: quadratic-time parsing on long runs of `~~x~~`, `==x==`, and `^^x^^` markers (strikethrough / mark / insert)", "source": {"advisory": "GHSA-c8j7-8cv4-2xmq", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "lepture", "product": "mistune", "versions": [{"status": "affected", "version": "< 3.3.0"}]}], "references": [{"url": "https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq", "name": "https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7", "name": "https://github.com/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/lepture/mistune/releases/tag/v3.3.0", "name": "https://github.com/lepture/mistune/releases/tag/v3.3.0", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-407", "description": "CWE-407: Inefficient Algorithmic Complexity"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1333", "description": "CWE-1333: Inefficient Regular Expression Complexity"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T16:12:00.545Z"}}}, "cveMetadata": {"cveId": "CVE-2026-59922", "state": "PUBLISHED", "dateUpdated": "2026-07-09T14:40:22.315Z", "dateReserved": "2026-07-07T18:20:06.125Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-07-08T16:12:00.545Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "mistune", "vendor": "lepture", "versions": [{"status": "affected", "version": "< 3.3.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*", "matchCriteriaId": "63E1B933-D2E2-44EF-A56C-94483300845B", "versionEndExcluding": "3.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0."}, {"lang": "es", "value": "Mistune es un analizador de Markdown en Python con renderizadores y plugins. Antes de la versi\u00f3n 3.3.0, una secuencia de pares de marcadores cerrados de tilde, signo de igual o acento circunflejo alrededor de un car\u00e1cter causa un trabajo cuadr\u00e1tico en src/mistune/plugins/formatting.py cuando el plugin de tachado, marcado o inserci\u00f3n busca marcadores coincidentes desde cada posible posici\u00f3n de inicio, permitiendo la denegaci\u00f3n de servicio por agotamiento de la CPU. Este problema se ha solucionado en la versi\u00f3n 3.3.0."}], "id": "CVE-2026-59922", "lastModified": "2026-10-25T17:10:00.197", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-59922", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-09T14:39:49.792478Z", "version": "2.0.3"}}]}, "published": "2026-07-08T17:17:27.770", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/lepture/mistune/releases/tag/v3.3.0"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}, {"lang": "en", "value": "CWE-1333"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-407"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.3.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "mistune", "source": "cna", "vendor": "lepture"}, "product": "mistune", "vendor": "lepture"}], "created": "2026-07-08T17:30:03.725219+00:00", "updated": "2026-08-01T16:00:05.145998+00:00", "vendors": ["lepture", "lepture$PRODUCT$mistune"]}