{
  "cveId": "CVE-2026-56865",
  "url": "https://patchblox.com/security/cve/CVE-2026-56865",
  "summary": "CVE-2026-56865 is fixed in 20 products on 2 platforms, first by SUSE-SU-2026:3640-1, released August 18, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog",
  "description": "A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected:   rm -r go.sum go.work.sum vendor/ \u0026\u0026 go mod tidy",
  "published": "2026-08-13T15:17:00Z",
  "severity": "Important",
  "cvss": 8.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "cwe": "Improper Verification of Cryptographic Signature",
  "epss": 0.00129,
  "epssPercentile": 0.02573,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56865",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Go Programming Language",
      "fixedVersion": "1.27.3",
      "fix": "Go Programming Language 1.27.3",
      "url": "https://patchblox.com/security/fix/windows-app/golang.go-1.27.3",
      "released": "2026-10-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "go1.25",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.25.13-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21592-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21592-1",
      "released": "2026-08-19T09:07:44Z"
    },
    {
      "platform": "linux",
      "product": "go1.25",
      "release": "sles 15.6",
      "fixedVersion": "1.25.13-150000.1.50.1",
      "fix": "SUSE-SU-2026:3640-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3640-1",
      "released": "2026-08-18T09:05:33Z"
    },
    {
      "platform": "linux",
      "product": "go1.25",
      "release": "sles 15.7",
      "fixedVersion": "1.25.13-150000.1.50.1",
      "fix": "SUSE-SU-2026:3640-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3640-1",
      "released": "2026-08-18T09:05:33Z"
    },
    {
      "platform": "linux",
      "product": "go1.25",
      "release": "sles 16.0",
      "fixedVersion": "1.25.13-160000.1.1",
      "fix": "SUSE-SU-2026:23300-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23300-1",
      "released": "2026-08-19T09:08:20Z"
    },
    {
      "platform": "linux",
      "product": "go1.25-openssl",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.25.14-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21696-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21696-1",
      "released": "2026-08-30T14:40:58Z"
    },
    {
      "platform": "linux",
      "product": "go1.25-openssl",
      "release": "sles 15.6",
      "fixedVersion": "1.25.14-150600.13.27.1",
      "fix": "SUSE-SU-2026:3815-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3815-1",
      "released": "2026-08-26T11:02:14Z"
    },
    {
      "platform": "linux",
      "product": "go1.25-openssl",
      "release": "sles 15.7",
      "fixedVersion": "1.25.14-150600.13.27.1",
      "fix": "SUSE-SU-2026:3815-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3815-1",
      "released": "2026-08-26T11:02:14Z"
    },
    {
      "platform": "linux",
      "product": "go1.25-openssl",
      "release": "sles 16.0",
      "fixedVersion": "1.25.14-160000.1.1",
      "fix": "SUSE-SU-2026:23573-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23573-1",
      "released": "2026-08-30T14:44:02Z"
    },
    {
      "platform": "linux",
      "product": "go1.26",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.26.6-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21593-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21593-1",
      "released": "2026-08-19T09:08:44Z"
    },
    {
      "platform": "linux",
      "product": "go1.26",
      "release": "sles 15.6",
      "fixedVersion": "1.26.6-150000.1.24.1",
      "fix": "SUSE-SU-2026:3641-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3641-1",
      "released": "2026-08-18T09:06:51Z"
    },
    {
      "platform": "linux",
      "product": "go1.26",
      "release": "sles 15.7",
      "fixedVersion": "1.26.6-150000.1.24.1",
      "fix": "SUSE-SU-2026:3641-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3641-1",
      "released": "2026-08-18T09:06:51Z"
    },
    {
      "platform": "linux",
      "product": "go1.26",
      "release": "sles 16.0",
      "fixedVersion": "1.26.6-160000.1.1",
      "fix": "SUSE-SU-2026:23301-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23301-1",
      "released": "2026-08-19T09:11:06Z"
    },
    {
      "platform": "linux",
      "product": "go1.26-openssl",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.26.7-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21705-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21705-1",
      "released": "2026-08-30T15:26:45Z"
    },
    {
      "platform": "linux",
      "product": "go1.26-openssl",
      "release": "sles 15.6",
      "fixedVersion": "1.26.7-150600.13.15.1",
      "fix": "SUSE-SU-2026:3816-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3816-1",
      "released": "2026-08-26T11:02:43Z"
    },
    {
      "platform": "linux",
      "product": "go1.26-openssl",
      "release": "sles 15.7",
      "fixedVersion": "1.26.7-150600.13.15.1",
      "fix": "SUSE-SU-2026:3816-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3816-1",
      "released": "2026-08-26T11:02:43Z"
    },
    {
      "platform": "linux",
      "product": "go1.26-openssl",
      "release": "sles 16.0",
      "fixedVersion": "1.26.7-160000.1.1",
      "fix": "SUSE-SU-2026:23576-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23576-1",
      "released": "2026-08-30T15:28:34Z"
    },
    {
      "platform": "linux",
      "product": "go1.27",
      "release": "sles 15.6",
      "fixedVersion": "1.27.0-150000.1.6.1",
      "fix": "SUSE-SU-2026:3830-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3830-1",
      "released": "2026-08-26T14:07:25Z"
    },
    {
      "platform": "linux",
      "product": "go1.27",
      "release": "sles 15.7",
      "fixedVersion": "1.27.0-150000.1.6.1",
      "fix": "SUSE-SU-2026:3830-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3830-1",
      "released": "2026-08-26T14:07:25Z"
    },
    {
      "platform": "linux",
      "product": "golang",
      "release": "amzn 2023",
      "fixedVersion": "1.26.7-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-2114",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2114",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "golang-1.22",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-golang-1.22-1.22.2-2-22.04.4",
      "released": "2026-10-20T16:41:43Z"
    },
    {
      "platform": "linux",
      "product": "golang-1.22",
      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-golang-1.22-1.22.2-2ubuntu0.5",
      "released": "2026-10-20T16:41:45Z"
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    {
      "platform": "linux",
      "product": "golang-1.22-go",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-golang-1.22-go-1.22.2-2-22.04.4",
      "released": "2026-10-20T16:41:43Z"
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    {
      "platform": "linux",
      "product": "golang-1.22-go",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.22.2-2ubuntu0.5",
      "fix": "golang-1.22-go 1.22.2-2ubuntu0.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-golang-1.22-go-1.22.2-2ubuntu0.5",
      "released": "2026-10-20T16:41:45Z"
    },
    {
      "platform": "linux",
      "product": "golang-1.22-src",
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      "fixedVersion": "1.22.2-2~22.04.4",
      "fix": "golang-1.22-src 1.22.2-2~22.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-golang-1.22-src-1.22.2-2-22.04.4",
      "released": "2026-10-20T16:41:43Z"
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    {
      "platform": "linux",
      "product": "golang-1.22-src",
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      "fixedVersion": "1.22.2-2ubuntu0.5",
      "fix": "golang-1.22-src 1.22.2-2ubuntu0.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-golang-1.22-src-1.22.2-2ubuntu0.5",
      "released": "2026-10-20T16:41:45Z"
    },
    {
      "platform": "linux",
      "product": "golang-1.26",
      "release": "Debian 14",
      "fixedVersion": "1.26.6-1",
      "fix": "DEBIAN-CVE-2026-56865",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-56865",
      "released": "2026-08-27T00:27:02Z"
    },
    {
      "platform": "linux",
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      "fix": "DEBIAN-CVE-2026-56865",
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      "released": "2026-08-27T00:27:02Z"
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    {
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      "released": "2026-08-31T09:00:00Z"
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    {
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      "fix": "ALAS2023-2026-2114",
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      "released": "2026-08-31T09:00:00Z"
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      "released": "2026-08-31T09:00:00Z"
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      "fix": "ALAS2023-2026-2114",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2114",
      "released": "2026-08-31T09:00:00Z"
    },
    {
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      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-2114",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2114",
      "released": "2026-08-31T09:00:00Z"
    },
    {
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      "product": "golang-tests",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-2114",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2114",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "govulncheck-vulndb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "0.0.20260827T195228-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21761-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21761-1",
      "released": "2026-09-04T12:30:23Z"
    },
    {
      "platform": "linux",
      "product": "govulncheck-vulndb",
      "release": "sles 16.0",
      "fixedVersion": "0.0.20260827T195228-160000.1.1",
      "fix": "SUSE-SU-2026:23625-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23625-1",
      "released": "2026-09-04T12:32:03Z"
    },
    {
      "platform": "linux",
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      "fix": "OPENSUSE-SU-2026:21983-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21983-1",
      "released": "2026-09-30T17:58:26Z"
    },
    {
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      "released": "2026-09-30T17:49:13Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}