CVE-2026-39826

{"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": "2026-05-08T14:05:05.849Z"}, "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)"}]}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-05-08T14:04:40.842823Z", "id": "CVE-2026-39826", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-08T14:05:05.849Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-39826", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-08T14:04:40.842823Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-08T14:05:00.652Z"}}], "cna": {"title": "Escaper bypass leads to XSS in html/template", "credits": [{"lang": "en", "value": "Mundur (https://github.com/M0nd0R)"}], "affected": [{"vendor": "Go standard library", "product": "html/template", "versions": [{"status": "affected", "version": "0", "lessThan": "1.25.10", "versionType": "semver"}, {"status": "affected", "version": "1.26.0-0", "lessThan": "1.26.3", "versionType": "semver"}], "packageName": "html/template", "collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "programRoutines": [{"name": "isJSType"}, {"name": "Template.Execute"}, {"name": "Template.ExecuteTemplate"}]}], "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"}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-05-07T19:41:19.138Z"}}}, "cveMetadata": {"cveId": "CVE-2026-39826", "state": "PUBLISHED", "dateUpdated": "2026-05-08T14:05:05.849Z", "dateReserved": "2026-04-07T18:13:03.528Z", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "datePublished": "2026-05-07T19:41:19.138Z", "assignerShortName": "Go"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "packageName": "html/template", "product": "html/template", "programRoutines": [{"name": "isJSType"}, {"name": "Template.Execute"}, {"name": "Template.ExecuteTemplate"}], "vendor": "Go standard library", "versions": [{"lessThan": "1.25.10", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "1.26.3", "status": "affected", "version": "1.26.0-0", "versionType": "semver"}]}], "source": "security@golang.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*", "matchCriteriaId": "1C966EF3-C51C-4239-B5FC-C44A5202FEC8", "versionEndExcluding": "1.25.10", "vulnerable": true}, {"criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*", "matchCriteriaId": "522E4CD0-2B99-4363-9C78-0BAFD988A2D6", "versionEndExcluding": "1.26.3", "versionStartIncluding": "1.26.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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."}, {"lang": "es", "value": "Si un autor de plantilla de confianza escribiera una etiqueta [script_tag] que contuviera un atributo \u2019type\u2019 vac\u00edo o un atributo \u2019type\u2019 con un espacio en blanco ASCII, la ejecuci\u00f3n de la plantilla escapar\u00eda incorrectamente cualquier dato pasado al bloque [script_tag]."}], "id": "CVE-2026-39826", "lastModified": "2026-10-26T20:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39826", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-08T14:04:40.842823Z", "version": "2.0.3"}}]}, "published": "2026-05-07T20:16:43.490", "references": [{"source": "security@golang.org", "tags": ["Patch"], "url": "https://go.dev/cl/771180"}, {"source": "security@golang.org", "tags": ["Patch"], "url": "https://go.dev/issue/78981"}, {"source": "security@golang.org", "tags": ["Release Notes"], "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"}, {"source": "security@golang.org", "tags": ["Vendor Advisory"], "url": "https://pkg.go.dev/vuln/GO-2026-4980"}], "sourceIdentifier": "security@golang.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-116"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{"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": "2026-05-13T20:45:04.197760+00:00", "vendors": ["go_standard_library", "go_standard_library$PRODUCT$html/template"]}