{
  "fix": "Go Programming Language 1.27.3",
  "url": "https://patchblox.com/security/fix/windows-app/golang.go-1.27.3",
  "summary": "Go Programming Language 1.27.3, released October 19, 2026, fixes 19 CVEs in Go Programming Language. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Go Programming Language is 1.27.4, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Go Programming Language 1.27.3",
  "released": "2026-10-19T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-56857, rated Critical",
  "supported": true,
  "cveCount": 19,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00716,
  "maxCvss": 9.8,
  "appliesTo": [
    {
      "product": "Go Programming Language",
      "productUrl": "https://patchblox.com/security/product/windows-app/go-programming-language",
      "fixedVersion": "1.27.3",
      "latestVersion": "1.27.4",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Go Programming Language",
    "latestVersion": "1.27.4",
    "productUrl": "https://patchblox.com/security/product/windows-app/go-programming-language"
  },
  "cves": [
    {
      "cveId": "CVE-2026-56857",
      "url": "https://patchblox.com/security/cve/CVE-2026-56857",
      "title": "Root.Mkdir(All) can follow junctions out of the root on Windows in os",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 9.8,
      "epss": 0.00553,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-97031",
      "url": "https://patchblox.com/security/cve/CVE-2026-97031",
      "title": "Reject malformed ECH outer extension references in crypto/tls",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00716,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-94440",
      "url": "https://patchblox.com/security/cve/CVE-2026-94440",
      "title": "Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00706,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56866",
      "url": "https://patchblox.com/security/cve/CVE-2026-56866",
      "title": "HTTP/1 client connection desynchronization after CONNECT rejection in net/http",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00604,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-33818",
      "url": "https://patchblox.com/security/cve/CVE-2026-33818",
      "title": "Enforce maximum recursion depth in encoding/asn1",
      "priority": "High",
      "severity": "Moderate",
      "cvss": 8.8,
      "epss": 0.00568,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56859",
      "url": "https://patchblox.com/security/cve/CVE-2026-56859",
      "title": "Add recursion depth guard during decode in encoding/xml",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00568,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56862",
      "url": "https://patchblox.com/security/cve/CVE-2026-56862",
      "title": "Limit handshake messages we are willing to accept post-handshake in crypto/tls",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00568,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56860",
      "url": "https://patchblox.com/security/cve/CVE-2026-56860",
      "title": "Avoid quadratic complexity in resolvePath in net/url",
      "priority": "High",
      "severity": "Moderate",
      "cvss": 8.8,
      "epss": 0.0055,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-46600",
      "url": "https://patchblox.com/security/cve/CVE-2026-46600",
      "title": "Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage",
      "priority": "High",
      "severity": "Moderate",
      "cvss": 7.5,
      "epss": 0.00549,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-111943",
      "url": "https://patchblox.com/security/cve/CVE-2026-111943",
      "title": "Go: CVE-2026-111943 Distrust compromised intermediate certificates in crypto/x509",
      "priority": "High",
      "severity": "Moderate",
      "cvss": 8.1,
      "epss": 0.00396,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56858",
      "url": "https://patchblox.com/security/cve/CVE-2026-56858",
      "title": "Fix Javascript regexp context tracking in html/template",
      "priority": "High",
      "severity": "Moderate",
      "cvss": 8.8,
      "epss": 0.0031,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56864",
      "url": "https://patchblox.com/security/cve/CVE-2026-56864",
      "title": "Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb",
      "priority": "High",
      "severity": "Moderate",
      "cvss": 7.5,
      "epss": 0.00298,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-39822",
      "url": "https://patchblox.com/security/cve/CVE-2026-39822",
      "title": "Root escape via symlink plus trailing slash in os",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00232,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56865",
      "url": "https://patchblox.com/security/cve/CVE-2026-56865",
      "title": "Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.4,
      "epss": 0.00129,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-94447",
      "url": "https://patchblox.com/security/cve/CVE-2026-94447",
      "title": "Checksum database bypass for golang.org/toolchain in cmd/go",
      "priority": "High",
      "severity": "Moderate",
      "cvss": 7.8,
      "epss": 0.00102,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-94444",
      "url": "https://patchblox.com/security/cve/CVE-2026-94444",
      "title": "Checksum bypass for golang.org/fips140 in cmd/go",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00097,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-42505",
      "url": "https://patchblox.com/security/cve/CVE-2026-42505",
      "title": "Invoking Encrypted Client Hello privacy leak in crypto/tls",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 5.3,
      "epss": 0.00382,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-94448",
      "url": "https://patchblox.com/security/cve/CVE-2026-94448",
      "title": "Reset context tracking on consecutive template expressions in html/template",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 6.1,
      "epss": 0.00289,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-97030",
      "url": "https://patchblox.com/security/cve/CVE-2026-97030",
      "title": "Recognize yield as regexp preceder keyword in html/template",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 6.1,
      "epss": 0.00289,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-11T13:47:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}