CVE-2026-67422

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{"affected": [{"affectedData": [{"product": "pymdown-extensions", "vendor": "facelessuser", "versions": [{"status": "affected", "version": "< 11.0.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "pymdown-extensions is a collection of extensions for the Python Markdown library. In versions up to and including 11.0, four inline processors (caret, tilde, betterem, and magiclink) use regular expressions whose content groups can partition a run of delimiter characters in exponentially many ways, causing catastrophic backtracking. As a result, a single untrusted Markdown line under 50 bytes rendered with markdown.markdown() in each extension's default configuration drives the rendering thread into unbounded CPU usage that grows exponentially with input length, enabling an unauthenticated remote attacker who can submit Markdown to cause denial of service. The exposure is concrete for web applications that render user-supplied Markdown (comments, wikis, issue bodies, live preview), including any app using pymdownx.extra which bundles the vulnerable betterem default, as well as hosted docs/CI systems that build untrusted Markdown. The issue has been fixed in version 11.0.1."}, {"lang": "es", "value": "pymdown-extensions es una colecci\u00f3n de extensiones para la biblioteca Python Markdown. En versiones hasta la 11.0 inclusive, cuatro procesadores en l\u00ednea (caret, tilde, betterem y magiclink) utilizan expresiones regulares cuyos grupos de contenido pueden particionar una secuencia de caracteres delimitadores de exponencialmente muchas maneras, causando retroceso catastr\u00f3fico. Como resultado, una \u00fanica l\u00ednea de Markdown no confiable de menos de 50 bytes renderizada con markdown.markdown() en la configuraci\u00f3n predeterminada de cada extensi\u00f3n lleva el hilo de renderizado a un uso ilimitado de CPU que crece exponencialmente con la longitud de la entrada, permitiendo a un atacante remoto no autenticado que puede enviar Markdown causar denegaci\u00f3n de servicio. La exposici\u00f3n es concreta para aplicaciones web que renderizan Markdown proporcionado por el usuario (comentarios, wikis, cuerpos de incidencias, vista previa en vivo), incluyendo cualquier aplicaci\u00f3n que use pymdownx.extra que incluye el valor predeterminado vulnerable de betterem, as\u00ed como sistemas de documentaci\u00f3n/CI alojados que construyen Markdown no confiable. El problema ha sido solucionado en la versi\u00f3n 11.0.1."}], "id": "CVE-2026-67422", "lastModified": "2026-10-24T16:10:00.153", "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-2026-67422", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-07T16:59:03.019688Z", "version": "2.0.3"}}]}, "published": "2026-08-06T22:18:21.600", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/facelessuser/pymdown-extensions/commit/c68498598d7b13011bb4571350b6e3612a4ce44b"}, {"source": "security-advisories@github.com", "url": "https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-gm37-52c6-37mw"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-gm37-52c6-37mw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1333"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "pymdown-extensions: Pymdown-extensions: Denial of Service via Regular Expression Vulnerability", "id": "2512322", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2512322"}, "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-1333", "details": ["A flaw was found in pymdown-extensions, a collection of extensions for the Python Markdown library. This vulnerability, known as a Regular Expression Denial of Service (ReDoS), arises from how certain inline processors handle regular expressions. An unauthenticated remote attacker can exploit this by submitting a short, untrusted Markdown line that causes the regular expression engine to perform an excessive number of calculations. This leads to unbounded CPU usage, effectively causing a denial of service for affected web applications or systems that process user-supplied Markdown."], "name": "CVE-2026-67422", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Affected", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "grafana12.4", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "grafana13.1", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "trivy", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-olm-catalogd-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/bootc-automation-portal-rhel9", "product_name": "Self-service automation portal 2"}], "public_date": "2026-08-06T20:26:31Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-67422\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-67422\nhttps://github.com/facelessuser/pymdown-extensions/commit/c68498598d7b13011bb4571350b6e3612a4ce44b\nhttps://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-gm37-52c6-37mw"], "statement": "This vulnerability is rated Important as it enables an unauthenticated remote attacker to trigger a Regular Expression Denial of Service (ReDoS) in Red Hat products that render untrusted Markdown via `pymdown-extensions`. Catastrophic backtracking in specific inline processors can lead to excessive CPU usage and service disruption.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,11.0.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "pymdown-extensions", "source": "cna", "vendor": "facelessuser"}, "product": "pymdown_extensions", "vendor": "facelessuser"}], "created": "2026-08-07T01:00:05.662988+00:00", "updated": "2026-08-07T01:15:05.053391+00:00", "vendors": ["facelessuser", "facelessuser$PRODUCT$pymdown_extensions"]}