{"identifier":"CVE-2026-40890","cve":{"id":"CVE-2026-40890","description":"The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a < character that is not followed by a > character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778.","published":"2026-04-21T20:17:02.810000+00:00","modified":"2026-10-26T21:10:00.170000+00:00","status":"Analyzed","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_version":"3.1","affected":[{"criteria":"cpe:2.3:a:gomarkdown:markdown:*:*:*:*:*:go:*:*","versionStartIncluding":"","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"2026-04-10"}],"weaknesses":["CWE-125"],"references":[{"url":"https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7","source":"security-advisories@github.com","tags":["Exploit","Vendor Advisory"]},{"url":"https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Vendor Advisory"]}],"kev":null,"kev_checked":true,"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-21T20:16:21.788511Z","id":"CVE-2026-40890","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:gomarkdown:markdown:*:*:*:*:*:go:*:*","versionEndExcluding":"2026-04-10","matchCriteriaId":"82C227BF-A9A1-4CD5-9664-916EAAB6DDAA"}]}]}],"source":"nvd","retrieved_at":"2026-10-28T10:19:23.943595+00:00","exploited":false,"kev_stale":false,"products":["gomarkdown / markdown"],"priority":{"label":"Assess exposure and vendor guidance","reasons":["No higher-priority signal is available in the current stored evidence."]},"epss":{"probability":0.00346,"percentile":0.28088,"date":"2026-10-29","stale":false},"version_assessment":null},"news":[],"campaigns":[],"domains":[{"domain":"github.com","source_url":"https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778","investigate_url":"https://investigate.aeglixmind.com/#github.com"}],"arsenal_url":"https://arsenal.aeglixmind.com/?cve=CVE-2026-40890","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-40890","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-40890","coverage":{"news_candidates_checked":0,"campaign_candidates_checked":0,"bounded":false,"notice":"Exact CVE mentions in stored public excerpts and reviewed campaign content only. A mention is not proof of exploitation, attribution or tool suitability. Missing matches do not establish absence."}}