{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-39826", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-04-07T18:13:03.528Z", "datePublished": "2026-05-07T19:41:19.138Z", "dateUpdated": "2026-05-07T19:41:19.138Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-05-07T19:41:19.138Z"}, "title": "Escaper bypass leads to XSS in html/template", "descriptions": [{"lang": "en", "value": "If a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the <script> block."}], "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": "isJSType"}, {"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/78981"}, {"url": "https://go.dev/cl/771180"}, {"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4980"}], "credits": [{"lang": "en", "value": "Mundur (https://github.com/M0nd0R)"}]}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "If a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the <script> block."}], "id": "CVE-2026-39826", "lastModified": "2026-05-07T20:38:04.860", "metrics": {}, "published": "2026-05-07T20:16:43.490", "references": [{"source": "security@golang.org", "url": "https://go.dev/cl/771180"}, {"source": "security@golang.org", "url": "https://go.dev/issue/78981"}, {"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-2026-4980"}], "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": "2026-05-07T21:24:19.887991+00:00", "updated": "2026-05-07T22:30:36.249594+00:00", "vendors": ["go_standard_library", "go_standard_library$PRODUCT$html/template"], "weaknesses": ["CWE-79"]}