{"id":"CVE-2026-88753","title":"A Regular-Expression Denial of Service (ReDoS) in the Markdown2","summary":"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.","severity":"high","published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T16:18:22.887","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88753","references":[{"url":"https://gist.github.com/NanaSec/354b4188bbd7f4105008c7b8be49b0ba","label":"cve@mitre.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88753.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-88753"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2553572"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-88753"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88753"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat","score-dispute"],"ingestedAt":"2026-10-15T16:13:11.489Z","epss":0.0039,"epssPercentile":0.32967,"cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-20T02:31:53.253542Z"},"cvssSource":"adp","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"cwe":["CWE-1333"],"scores":{"adp":7.5,"vendor":5.3},"slug":"CVE-2026-88753","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88753.json)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":225318,"id":"CVE-2026-88753","ts":1792464718893,"field":"exploit_available","old":"false","new":"true"},{"seq":225317,"id":"CVE-2026-88753","ts":1792464718893,"field":"cvss","old":null,"new":"7.5"},{"seq":225316,"id":"CVE-2026-88753","ts":1792464718893,"field":"severity","old":"none","new":"high"}]}