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CVE-2026-56858 Fix Javascript regexp context tracking in html/template

🗓️ 13 Aug 2026 21:58:53Reported by GoType 
cvelist
 cvelist
🔗 www.cve.org👁 45 Views

Go html/template regex context tracking flaw allows early unescaped '/' injection enabling XSS.

Related
Affected
Refs
[
  {
    "vendor": "Go standard library",
    "product": "html/template",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "html/template",
    "versions": [
      {
        "version": "0",
        "lessThan": "1.25.13",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.26.0-0",
        "lessThan": "1.26.6",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.27.0-0",
        "lessThan": "1.27.0-rc.3",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "programRoutines": [
      {
        "name": "tJS"
      },
      {
        "name": "Template.Execute"
      },
      {
        "name": "Template.ExecuteTemplate"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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13 Aug 2026 21:58Current
CVSS 3.16.1
EPSS0.0031
SSVC
45