{"id":"CVE-2026-115351","aliases":[],"cve":{"records":[{"id":"CVE-2026-115351","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-22T11:20:02.626Z","published":"2026-10-22T19:13:27.678Z","modified":"2026-10-29T11:53:14.490Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-22T19:13:27.678Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T11:53:14.490Z"}],"references":[{"url":"https://github.com/lepture/mistune/security/advisories/GHSA-xmwc-wjpr-q378","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/mistune-3.2.1-before-3.3.0-css-injection-via-figure-directive-figwidth-option","tags":["third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/lepture/mistune/security/advisories/GHSA-xmwc-wjpr-q378","tags":["exploit"],"source":"CISA-ADP"}],"weaknesses":[{"id":"CWE-94","description":"Improper Control of Generation of Code ('Code Injection')","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2.1","versionEndExcluding":"3.3.0"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T11:52:50.353872Z","decisions":[{"name":"Exploitation","value":"poc"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"Mistune from 3.2.1 before 3.3.0 contains a CSS injection vulnerability that allows attackers controlling markdown input to inject arbitrary style declarations via the unvalidated figwidth option of the figure directive. Attackers can append declarations like background:url() to the rendered figure style attribute, forcing victim browsers to send requests to attacker servers and leak attribute values.","score":5.3,"severity":"medium","published":"2026-10-22T19:13:27.678Z","modified":"2026-10-29T11:53:14.490Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"lepture","name":"mistune","platforms":[],"versions":[{"version":"3.2.1","status":"affected","lessThan":"3.3.0","versionType":"semver"},{"version":"3.3.0","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:pypi/mistune","packageIdentity":{"ecosystem":"PyPI","name":"mistune"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-115351"}],"remediation":[],"references":["https://github.com/lepture/mistune/security/advisories/GHSA-xmwc-wjpr-q378","https://www.vulncheck.com/advisories/mistune-3.2.1-before-3.3.0-css-injection-via-figure-directive-figwidth-option"],"sources":[{"name":"CVE","id":"CVE-2026-115351","modified":"2026-10-29T11:53:14.490Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-115351"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":5.3},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","score":4.7}],"sourceAffected":[],"observedAt":"2026-10-29T14:34:20.787Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T17:05:30.676Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-29T12:10:34.238Z","attemptedAt":"2026-10-29T12:10:34.238Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-29T12:10:34.238Z","attemptedAt":"2026-10-29T12:10:34.238Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-29T12:10:34.238Z","attemptedAt":"2026-10-29T12:10:34.238Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-29T12:10:34.238Z","attemptedAt":"2026-10-29T12:10:34.238Z"}],"evidence":[{"source":"NVD","id":"CVE-2026-115351","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115351","modified":"2026-10-22T19:17:41.033","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-10-29T12:10:34.238Z"},{"source":"NVD","id":"CVE-2026-115351","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115351","modified":"2026-10-22T19:17:41.033","score":4.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","checkedAt":"2026-10-29T12:10:34.238Z"},{"source":"FIRST EPSS","id":"CVE-2026-115351","url":"https://www.first.org/epss/","probability":0.00221,"percentile":0.12663,"date":"2026-10-28","checkedAt":"2026-10-29T12:10:34.238Z"},{"source":"GitHub Advisory Database","id":"GHSA-2jmw-jfgq-rw98","url":"https://github.com/advisories/GHSA-2jmw-jfgq-rw98","modified":"2026-10-22T21:32:36Z","score":4.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","checkedAt":"2026-10-29T12:10:34.238Z"},{"source":"ENISA EUVD","id":"EUVD-2026-108420","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-108420","modified":"Oct 29, 2026, 11:53:14 AM","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","checkedAt":"2026-10-29T12:10:34.238Z"}],"aiSummary":{"text":"Mistune versions before 3.3.0 have a CSS injection vulnerability via the figwidth option, allowing attackers to inject style declarations. Attackers can force victim browsers to send requests to attacker servers.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:37:52.858Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-115351"}]}}