CVE-2026-62370: KubeEdge Denial of Service Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-gfw4-49f9-cp25",
  "modified" : "2026-09-22T20:37:02Z",
  "published" : "2026-09-22T20:37:01Z",
  "aliases" : [ "CVE-2026-62370" ],
  "summary" : "KubeEdge: Unbounded allocation in viaduct packer enables authenticated remote DoS against CloudHub",
  "details" : "## Summary\n\nKubeEdge CloudHub uses the viaduct packer to decode messages received from connected peers. The packer reads a 32-bit payload length from the message header and previously allocated a buffer of that size without enforcing an upper bound.\n\nAn authenticated peer that can establish a viaduct connection to CloudHub can send a crafted message header containing an excessively large payload length. This may cause CloudHub to allocate a large amount of memory and can result in memory exhaustion, process termination, or denial of service.\n\n## Impact\n\nA successfully authenticated malicious or compromised edge node may repeatedly send crafted viaduct message headers to increase CloudHub memory consumption.\n\nDepending on available memory and deployment limits, exploitation may cause:\n\n* Increased CloudHub memory usage\n* Out-of-memory termination\n* CloudHub restart loops\n* Temporary disruption of cloud-edge communication\n\nAuthentication to the viaduct endpoint is required. This issue does not provide unauthenticated access or direct code execution.\n\n## Root cause\n\nThe viaduct packer trusted the payload length encoded in the message header and allocated the payload buffer before validating whether the declared length was within an acceptable range.\n\n## Fix\n\nThe fix introduces a maximum viaduct payload size of 32 MiB.\n\nThe updated implementation:\n\n* Rejects oversized payload lengths in the reader before memory allocation\n* Enforces the same maximum size in the writer\n* Adds regression tests covering oversized and valid payloads\n\nFixes have been prepared for the following patch releases:\n\n* KubeEdge v1.23.1\n* KubeEdge v1.22.2\n* KubeEdge v1.21.2\n\nThese versions should not be listed as released until the coordinated release process is complete.\n\n## Workarounds\n\nBefore patched versions are available, operators should:\n\n* Restrict access to the CloudHub endpoint to trusted edge nodes and networks\n* Protect and rotate edge-node credentials\n* Revoke credentials belonging to decommissioned or potentially compromised nodes\n* Apply memory limits and restart policies to the CloudHub workload\n* Monitor CloudHub memory consumption and unexpected connection activity\n\n## Affected component\n\n* `pkg/viaduct/pkg/packer`\n* CloudHub viaduct message-processing path\n\n## Credits\n\nKubeEdge thanks Sang-Hoon Choi ([KoreaSecurity](https://github.com/KoreaSecurity), Sejong University)\nfor responsibly reporting this issue and for coordinating with the KubeEdge\nmaintainers through the security disclosure process.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/kubeedge/kubeedge"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.21.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/kubeedge/kubeedge"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.22.0"
      }, {
        "fixed" : "1.22.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/kubeedge/kubeedge"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.23.0"
      }, {
        "fixed" : "1.23.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/security/advisories/GHSA-gfw4-49f9-cp25"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-62370"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/pull/7028"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/pull/7029"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/pull/7030"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/commit/0fe1ea18e5d7fde29633286ddf1c7e71cb39606f"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/commit/725a73ca35a65d91aa6338e52b8faaab6058f528"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/commit/cc79621943fff9d3f62638d9403ef0cfeda3d0e7"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kubeedge/kubeedge"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/blob/master/CHANGELOG/CHANGELOG-1.21.md"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/blob/master/CHANGELOG/CHANGELOG-1.22.md"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/blob/master/CHANGELOG/CHANGELOG-1.23.md"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/releases/tag/v1.21.2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/releases/tag/v1.22.2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubeedge/kubeedge/releases/tag/v1.23.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-789" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-22T20:37:01Z",
    "nvd_published_at" : "2026-09-21T17:17:36Z"
  }
}