{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-115349","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-10-22T11:20:02.626Z","datePublished":"2026-10-22T19:13:26.171Z","dateUpdated":"2026-10-26T19:38:30.354Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-10-22T19:13:26.171Z"},"datePublic":"2026-06-21T00:00:00.000Z","title":"Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing","descriptions":[{"lang":"en","value":"Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted requests."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Inefficient Regular Expression Complexity","cweId":"CWE-1333","type":"CWE"}]}],"affected":[{"vendor":"lepture","product":"mistune","defaultStatus":"unaffected","packageURL":"pkg:pypi/mistune","versions":[{"version":"3.0.0","status":"affected","versionType":"semver","lessThan":"3.3.0"},{"version":"3.3.0","status":"unaffected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*","versionStartIncluding":"3.0.0","versionEndExcluding":"3.3.0"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"}}],"references":[{"url":"https://github.com/lepture/mistune/security/advisories/GHSA-3q64-rw38-243v","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-3q64-rw38-243v)"},{"name":"VulnCheck Advisory: Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/mistune-3.0.0-before-3.3.0-denial-of-service-via-nested-bracket-parsing"}],"credits":[{"lang":"en","value":"dapickle","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-115349","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-26T19:27:03.150656Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-26T19:38:30.354Z"}}]}}