{"id":"CVE-2026-105830","title":"league/commonmark from 2.0.0 before 2.10.2 contains a quadratic-time denial of service vulnerability in the GitHub Flavored Markdown Table extension's TableStartParser::tryStart() block-start scan","summary":"league/commonmark from 2.0.0 before 2.10.2 contains a quadratic-time denial of service vulnerability in the GitHub Flavored Markdown Table extension's TableStartParser::tryStart() block-start scan. Unauthenticated attackers can submit a …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400"],"vendor":"thephpleague","product":"commonmark","affected":["commonmark >= 2.0.0 < 2.10.2"],"published":"2026-10-08","updated":"2026-10-08","sourceUpdated":"2026-10-08T17:17:12.843","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-105830","references":[{"url":"https://github.com/thephpleague/commonmark/security/advisories/GHSA-3q6v-r5mr-hxv8","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/league-commonmark-2.0.0-before-2.10.2-quadratic-dos-via-tablestartparser","label":"disclosure@vulncheck.com"},{"url":"https://github.com/thephpleague/commonmark/security/advisories/GHSA-3q6v-r5mr-hxv8","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-08T17:03:04.954507Z"},"ingestedAt":"2026-10-08T14:47:16.361Z","slug":"CVE-2026-105830","body":"## Overview\n\nleague/commonmark from 2.0.0 before 2.10.2 contains a quadratic-time denial of service vulnerability in the GitHub Flavored Markdown Table extension's TableStartParser::tryStart() block-start scan. Unauthenticated attackers can submit a large paragraph of pipe-free lines not starting with letters, forcing repeated full-buffer strpos scans that exhaust PHP worker CPU.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":218227,"id":"CVE-2026-105830","ts":1791482238724,"field":"exploit_available","old":"false","new":"true"}]}