{"id":"CVE-2026-115348","title":"Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text","summary":"Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser's parse_link_text function that allows unauthenticated attackers to exhaust CPU with unbalanced brackets. Attackers can submit Mar…","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","cvssSource":"cna","cwe":["CWE-400","CWE-606"],"vendor":"lepture","product":"mistune","affected":["mistune >= 3.0.0 < 3.3.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-23T17:33:00.385741Z"},"published":"2026-10-22","updated":"2026-10-23","sourceUpdated":"2026-10-23T21:07:57.729Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115348","references":[{"url":"https://github.com/lepture/mistune/security/advisories/GHSA-x2gr-6qf2-fc9x","label":"GitHub Security Advisory (GHSA-x2gr-6qf2-fc9x)"},{"url":"https://www.vulncheck.com/advisories/mistune-before-3.3.0-quadratic-time-dos-via-parse-link-text","label":"VulnCheck Advisory: Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115348.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-115348"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2559376"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-115348"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115348"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00438,"epssPercentile":0.379,"ingestedAt":"2026-10-22T22:00:50.395Z","slug":"CVE-2026-115348","body":"## Overview\n\nMistune from 3.0.0 before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser's parse_link_text function that allows unauthenticated attackers to exhaust CPU with unbalanced brackets. Attackers can submit Markdown containing many unbalanced '[' or '![' characters, forcing repeated unbounded forward scans and tying up worker processes for minutes.\n\n## Affected\n\n- `mistune >= 3.0.0 < 3.3.0`\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** · Important · affected: Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115348.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}