CVE-2026-88753

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A Regular-Expression Denial of Service (ReDoS) in the Markdown2. extract_metadata() function (lib/markdown2.py) of trentm markdown2 through v2.5.5 allows attackers to cause a Denial of Service (DoS) via a crafted Markdown document."}], "id": "CVE-2026-88753", "lastModified": "2026-10-20T03:17:17.410", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-88753", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-20T02:31:53.253542Z", "version": "2.0.3"}}]}, "published": "2026-10-15T16:18:22.887", "references": [{"source": "cve@mitre.org", "url": "https://gist.github.com/NanaSec/354b4188bbd7f4105008c7b8be49b0ba"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://gist.github.com/NanaSec/354b4188bbd7f4105008c7b8be49b0ba"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "markdown2: markdown2: Denial of Service via crafted Markdown document", "id": "2553572", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2553572"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-1333", "details": ["A flaw was found in markdown2. In the extract_metadata function, an inefficient regular expression used to parse document metadata can take an exponential amount of time to process. An attacker can exploit this vulnerability by providing a crafted Markdown document, causing excessive resource consumption and leading to a Denial of Service (DoS)."], "name": "CVE-2026-88753", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift4/ose-olm-catalogd-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88753\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88753\nhttps://gist.github.com/NanaSec/354b4188bbd7f4105008c7b8be49b0ba"], "threat_severity": "Moderate"}

{"created": "2026-10-16T07:30:14.968437+00:00", "updated": "2026-10-20T12:45:15.244290+00:00", "vendors": []}