CVE-2026-39826

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.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://go.dev/cl/771180	Patch
https://go.dev/issue/78981	Patch
https://groups.google.com/g/golang-announce/c/qcCIEXso47M	Release Notes
https://pkg.go.dev/vuln/GO-2026-4980	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:golang:go::::::::
	cpe:2.3:a:golang:go::::::::

History

26 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Si un autor de plantilla de confianza escribiera una etiqueta [script_tag] que contuviera un atributo ’type’ vacío o un atributo ’type’ con un espacio en blanco ASCII, la ejecución de la plantilla escaparía incorrectamente cualquier dato pasado al bloque [script_tag].

Information

Published : 2026-05-07 20:16

Updated : 2026-10-26 20:10

NVD link : CVE-2026-39826

Mitre link : CVE-2026-39826

CVE.ORG link : CVE-2026-39826

JSON object : View

Products Affected

golang

go

CWE

CWE-116

Improper Encoding or Escaping of Output

{"id": "CVE-2026-39826", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39826", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-08T14:04:40.842823Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"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"}, "impactScore": 2.7, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security@golang.org", "affectedData": [{"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"}]}]}], "published": "2026-05-07T20:16:43.490", "references": [{"url": "https://go.dev/cl/771180", "tags": ["Patch"], "source": "security@golang.org"}, {"url": "https://go.dev/issue/78981", "tags": ["Patch"], "source": "security@golang.org"}, {"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M", "tags": ["Release Notes"], "source": "security@golang.org"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4980", "tags": ["Vendor Advisory"], "source": "security@golang.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-116"}]}], "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]."}], "lastModified": "2026-10-26T20:10:00.160", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1C966EF3-C51C-4239-B5FC-C44A5202FEC8", "versionEndExcluding": "1.25.10"}, {"criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "522E4CD0-2B99-4363-9C78-0BAFD988A2D6", "versionEndExcluding": "1.26.3", "versionStartIncluding": "1.26.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@golang.org"}