Dgraph: Zero Unauthenticated HTTP Admin removeNode Denial of Service

{
  "id": "8c7f68cbf53c05276fa39d8f01f9fbc401bb0dedbd692ab60c769e3892df415c",
  "url": "https://osv.dev/vulnerability/GHSA-qj98-gp63-54xj",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Dgraph: Zero Unauthenticated HTTP Admin removeNode Denial of Service",
    "summary": "### Summary Dgraph `v25.3.8` exposes a Zero HTTP administrative surface that is unauthenticated when port `6080` is reachable. The exposed routes include: - `/state` - `/assign` - `/removeNode` - `/moveTablet` An unauthenticated request to `/removeNode?id=1&group=0` on a single-node standalone deployment breaks the Zero control plane and leaves Alpha repeatedly failing to reconnect to `localhost:5080`. ### Details The issue exists because Zero administrative HTTP endpoints are registered directly without any authentication or IP-whitelist wrapper. Relevant code paths: - `worker/server_state.go:41` - `dgraph/cmd/zero/run.go:295-301` - `dgraph/cmd/zero/http.go:106-129` - `dgraph/cmd/zero/zero.go:475-477` The relevant behavior is: - `disable-admin-http=false` by default - `/removeNode` accepts attacker-controlled `id` and `group` - `removeNode` forwards those directly into `Server.RemoveNode` - for `group=0`, `Server.RemoveNode` immediately calls `ProposePeerRemoval` This means a remote unauthenticated caller can directly trigger destructive membership operations if `6080` is exposed. ### PoC ### Read state without authentication ```bash curl -i http://127.0.0.1:6080/state ``` Observed response included: - Zero node `id=1` - `groupId=0` - `leader=true` - cluster topology and tablet state ### Write-capable route without authentication ```bash curl -i 'http://127.0.0.1:6080/assign?what=nsids&num=1' ``` Observed response: ```text HTTP/1.1 200 OK ... {\"startId\":\"1\", \"endId\":\"1\", \"re",
    "evidence": "osv:GHSA-qj98-gp63-54xj",
    "products": [
      {
        "name": {
          "value": "github.com/dgraph-io/dgraph/v25",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "25.4.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "GHSA-qj98-gp63-54xj",
      "aliases": [
        "CVE-2026-102748",
        "GHSA-qj98-gp63-54xj"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "25.4.0"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/dgraph-io/dgraph/v25",
            "purl": "pkg:golang/github.com/dgraph-io/dgraph/v25",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-qj98-gp63-54xj/GHSA-qj98-gp63-54xj.json",
            "last_known_affected_version_range": "<= 25.3.8"
          }
        }
      ],
      "modified": "2026-10-15T20:30:07.056401611Z",
      "provider": "osv",
      "references": [
        "https://github.com/dgraph-io/dgraph/security/advisories/GHSA-qj98-gp63-54xj",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-102748",
        "https://github.com/dgraph-io/dgraph/commit/c32f6041387fa631dbc057e265b71aec3384ead1",
        "https://github.com/dgraph-io/dgraph",
        "https://github.com/dgraph-io/dgraph/releases/tag/v25.4.0"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-306",
          "CWE-862"
        ],
        "severity": "CRITICAL",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-14T19:17:05Z",
        "github_reviewed_at": "2026-10-15T20:17:22Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-102748",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 336054,
  "published_at": "2026-10-15T20:17:22+00:00"
}