{"id":"CVE-2026-56858","sourceIdentifier":"security@golang.org","published":"2026-08-13T22:17:22.207","lastModified":"2026-09-03T16:37:52.170","vulnStatus":"Awaiting Analysis","cveTags":[],"descriptions":[{"lang":"en","value":"Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially 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":"tJS"},{"name":"Template.Execute"},{"name":"Template.ExecuteTemplate"}],"versions":[{"version":"0","lessThan":"1.25.13","versionType":"semver","status":"affected"},{"version":"1.26.0-0","lessThan":"1.26.6","versionType":"semver","status":"affected"},{"version":"1.27.0-0","lessThan":"1.27.0-rc.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":"2026-08-14T15:31:30.140536Z","id":"CVE-2026-56858","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","description":[{"lang":"en","value":"CWE-79"}]}],"references":[{"url":"https://go.dev/cl/807100","source":"security@golang.org"},{"url":"https://go.dev/issue/80435","source":"security@golang.org"},{"url":"https://groups.google.com/g/golang-announce/c/94pEornpRlI","source":"security@golang.org"},{"url":"https://pkg.go.dev/vuln/GO-2026-6091","source":"security@golang.org"}]}