{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-39823", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-04-07T18:13:03.527Z", "datePublished": "2026-05-07T19:41:19.524Z", "dateUpdated": "2026-05-07T19:41:19.524Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-05-07T19:41:19.524Z"}, "title": "Bypass of meta content URL escaping causes XSS in html/template", "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": [{"vendor": "Go standard library", "product": "html/template", "collectionURL": "https://pkg.go.dev", "packageName": "html/template", "versions": [{"version": "0", "lessThan": "1.25.10", "status": "affected", "versionType": "semver"}, {"version": "1.26.0-0", "lessThan": "1.26.3", "status": "affected", "versionType": "semver"}], "programRoutines": [{"name": "tMetaContent"}, {"name": "Template.Execute"}, {"name": "Template.ExecuteTemplate"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "references": [{"url": "https://go.dev/issue/78913"}, {"url": "https://go.dev/cl/769920"}, {"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4982"}], "credits": [{"lang": "en", "value": "Samy Ghannad"}]}}}

{}

{"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."}], "id": "CVE-2026-39823", "lastModified": "2026-05-07T20:38:04.860", "metrics": {}, "published": "2026-05-07T20:16:43.290", "references": [{"source": "security@golang.org", "url": "https://go.dev/cl/769920"}, {"source": "security@golang.org", "url": "https://go.dev/issue/78913"}, {"source": "security@golang.org", "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"}, {"source": "security@golang.org", "url": "https://pkg.go.dev/vuln/GO-2026-4982"}], "sourceIdentifier": "security@golang.org", "vulnStatus": "Awaiting Analysis"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.25.10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.26.0-0,1.26.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "html/template", "source": "cna", "vendor": "Go standard library"}, "product": "html/template", "vendor": "go_standard_library"}], "created": "2026-05-07T21:30:25.963521+00:00", "updated": "2026-05-07T23:00:07.799489+00:00", "vendors": ["go_standard_library", "go_standard_library$PRODUCT$html/template"], "weaknesses": ["CWE-79"]}