{"id":"CVE-2026-40890","sourceIdentifier":"security-advisories@github.com","published":"2026-04-21T20:17:02.810","lastModified":"2026-06-17T10:45:50.027","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"gomarkdown","product":"markdown","versions":[{"version":"< 759bbc3e32073c3bc4e25969c132fc520eda2778","status":"affected"}]}]}],"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"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-125"}]}],"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"}]}]}],"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"]}]}