{"id":"CVE-2026-39823","sourceIdentifier":"security@golang.org","published":"2026-05-07T20:16:43.290","lastModified":"2026-06-17T10:42:38.473","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS."}],"affected":[{"source":"security@golang.org","affectedData":[{"vendor":"Go standard library","product":"html/template","defaultStatus":"unaffected","collectionURL":"https://pkg.go.dev","packageName":"html/template","programRoutines":[{"name":"tMetaContent"},{"name":"Template.Execute"},{"name":"Template.ExecuteTemplate"}],"versions":[{"version":"0","lessThan":"1.25.10","versionType":"semver","status":"affected"},{"version":"1.26.0-0","lessThan":"1.26.3","versionType":"semver","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","baseScore":6.1,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":2.7}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-08T14:05:34.310805Z","id":"CVE-2026-39823","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-79"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*","versionEndExcluding":"1.25.10","matchCriteriaId":"1C966EF3-C51C-4239-B5FC-C44A5202FEC8"},{"vulnerable":true,"criteria":"cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*","versionStartIncluding":"1.26.0","versionEndExcluding":"1.26.3","matchCriteriaId":"522E4CD0-2B99-4363-9C78-0BAFD988A2D6"}]}]}],"references":[{"url":"https://go.dev/cl/769920","source":"security@golang.org","tags":["Patch"]},{"url":"https://go.dev/issue/78913","source":"security@golang.org","tags":["Issue Tracking"]},{"url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M","source":"security@golang.org","tags":["Release Notes"]},{"url":"https://pkg.go.dev/vuln/GO-2026-4982","source":"security@golang.org","tags":["Vendor Advisory"]}]}