{
  "canonical_id": "traefik--GHSA-46wh-3698-f2cx",
  "system_id": "traefik",
  "display_name": "Traefik",
  "category": "servers",
  "advisory_mode": "server",
  "title": "Traefik: Deny Rule Bypass via Unauthenticated Malicious gRPC Requests in gRPC-Go Dependency (CVE-2026-33186)",
  "summary": "## Summary\n\nThere is a potential vulnerability in Traefik due to its dependency on an affected version of gRPC-Go (CVE-2026-33186).\n\nA remote, unauthenticated attacker can send gRPC requests with a malformed HTTP/2 `:path` pseudo-header omitting the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server routes such requests correctly, path-based authorization interceptors evaluate the raw non-canonical path and fail to match \"deny\" rules, allowing the request to bypass the policy entirely if a fallback \"allow\" rule is present.\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.42\n- https://github.com/traefik/traefik/releases/tag/v3.6.12\n- https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.3\n\n## For more information\n\nIf there are any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n<details>\n<summary>Original Description</summary>\n\n### Summary\nThis CVE hits traefik until Version 3.6.11 and 2.11.41.\ngRPC-Go has an authorization bypass via missing leading slash in :path\n### Details\nAs described in https://github.com/advisories/GHSA-p77j-4mvh-x3m3\n### PoC\nUpdate library version in \nhttps://github.com/traefik/traefik/blob/67c64ed9b25fbb90f1086977a62827133a7aa01b/go.mod#L108\n### Impact\nIs described in https://github.com/advisories/GHSA-p77j-4mvh-x3m3\n\n</details>\n\n\n----------",
  "published_at": "2026-03-29T15:37:28Z",
  "updated_at": "2026-03-29T15:49:22.073498Z",
  "severity": "medium",
  "cvss_score": 4.0,
  "exploit_status": "unknown",
  "source_confidence": "official",
  "official_source_url": "https://github.com/traefik/traefik/security/advisories/GHSA-46wh-3698-f2cx",
  "secondary_source_urls": [
    "https://github.com/advisories/GHSA-p77j-4mvh-x3m3",
    "https://github.com/traefik/traefik",
    "https://github.com/traefik/traefik/blob/67c64ed9b25fbb90f1086977a62827133a7aa01b/go.mod#L108",
    "https://github.com/traefik/traefik/releases/tag/v2.11.42",
    "https://github.com/traefik/traefik/releases/tag/v3.6.12",
    "https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.3"
  ],
  "aliases": [
    "GHSA-46wh-3698-f2cx"
  ],
  "cve_ids": [],
  "ghsa_ids": [
    "GHSA-46wh-3698-f2cx"
  ],
  "osv_ids": [
    "GHSA-46wh-3698-f2cx"
  ],
  "affected_versions": [
    "introduced=0, fixed<2.11.42",
    "introduced=3.0.0-beta3, fixed<3.6.12",
    "introduced=3.7.0-ea.1, fixed<3.7.0-ea.3"
  ],
  "fixed_versions": [
    "2.11.42",
    "3.6.12",
    "3.7.0-ea.3"
  ],
  "package_name": "github.com/traefik/traefik/v3",
  "render_markdown": false,
  "case_path": null,
  "secure_code_topics": [
    "proxy-trust-boundary",
    "request-smuggling-boundary",
    "authz-server-side-recheck",
    "dependency-upgrade-policy"
  ],
  "status": "generated",
  "triage_reasons": [],
  "entity_refs": [
    {
      "entity_id": "traefik",
      "entity_type": "system",
      "relation": "root-system",
      "root_system_id": "traefik",
      "official": true
    },
    {
      "entity_id": "traefik--repo--github-com-traefik-traefik-v3",
      "entity_type": "repo",
      "relation": "affected-component",
      "root_system_id": "traefik",
      "official": false
    }
  ],
  "affected_components": [
    {
      "name": "traefik / traefik / v3",
      "entity_id": "traefik--repo--github-com-traefik-traefik-v3",
      "scope": "repo",
      "package_name": "github.com/traefik/traefik/v3",
      "official": false
    }
  ],
  "affected_version_ranges": [
    "introduced=0, fixed<2.11.42",
    "introduced=3.0.0-beta3, fixed<3.6.12",
    "introduced=3.7.0-ea.1, fixed<3.7.0-ea.3"
  ],
  "fixed_version_ranges": [
    "2.11.42",
    "3.6.12",
    "3.7.0-ea.3"
  ],
  "introduced_version": "introduced=3.7.0-ea.1, fixed<3.7.0-ea.3",
  "patched_version": "2.11.42",
  "version_evidence_sources": [
    "https://github.com/traefik/traefik/security/advisories/GHSA-46wh-3698-f2cx",
    "https://github.com/advisories/GHSA-p77j-4mvh-x3m3",
    "https://github.com/traefik/traefik",
    "https://github.com/traefik/traefik/blob/67c64ed9b25fbb90f1086977a62827133a7aa01b/go.mod#L108",
    "https://github.com/traefik/traefik/releases/tag/v2.11.42",
    "https://github.com/traefik/traefik/releases/tag/v3.6.12",
    "https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.3"
  ],
  "affected_version_refs": [
    "traefik--repo--github-com-traefik-traefik-v3--introduced-0-fixed-2-11-42",
    "traefik--repo--github-com-traefik-traefik-v3--introduced-3-0-0-beta3-fixed-3-6-12",
    "traefik--repo--github-com-traefik-traefik-v3--introduced-3-7-0-ea-1-fixed-3-7-0-ea-3"
  ],
  "fixed_version_refs": [
    "traefik--repo--github-com-traefik-traefik-v3--2-11-42",
    "traefik--repo--github-com-traefik-traefik-v3--3-6-12",
    "traefik--repo--github-com-traefik-traefik-v3--3-7-0-ea-3"
  ],
  "patched_version_refs": [
    "traefik--repo--github-com-traefik-traefik-v3--2-11-42"
  ],
  "version_sync_confidence": "high",
  "advisory_scope": "repo",
  "version_confidence": "high",
  "version_gap_reason": "",
  "version_resolution_needed": false,
  "workflow": {
    "workflow_id": "traefik--GHSA-46wh-3698-f2cx--workflow",
    "vuln_family": "authz-bypass",
    "entry_surface": "privileged-route-or-object-reference",
    "preconditions": [
      "\u4ec5\u5728 lab-local\u3001lab-public \u6216\u660e\u786e\u6388\u6743\u76ee\u6807\u4e2d\u6267\u884c\u3002",
      "\u786e\u8ba4\u76ee\u6807\u547d\u4e2d\u7248\u672c\u65ad\u8a00: introduced=0, fixed<2.11.42, introduced=3.0.0-beta3, fixed<3.6.12, introduced=3.7.0-ea.1, fixed<3.7.0-ea.3",
      "\u82e5\u5bf9\u8c61\u5c5e\u4e8e `repo`\uff0c\u5148\u786e\u8ba4\u6269\u5c55/\u4ed3\u5e93/\u5305\u5df2\u542f\u7528\u5e76\u5904\u4e8e\u53d7\u5f71\u54cd\u7248\u672c\u3002"
    ],
    "required_role": "cross-tenant-or-low-privileged-user",
    "affected_version_assertion": [
      "introduced=0, fixed<2.11.42",
      "introduced=3.0.0-beta3, fixed<3.6.12",
      "introduced=3.7.0-ea.1, fixed<3.7.0-ea.3"
    ],
    "trigger_vector": "\u5bf9 `authz-bypass` \u5bb6\u65cf\u5165\u53e3\u6295\u9012\u6700\u5c0f\u5316\u3001\u53ef\u5ba1\u8ba1\u3001\u53ef\u56de\u6eda\u7684\u53d7\u63a7\u8f93\u5165\uff0c\u6bd4\u8f83\u4fee\u590d\u524d\u540e\u5dee\u5f02\u3002",
    "request_or_ui_path": [
      "/admin/*",
      "/api/private/*",
      "/tenant/*"
    ],
    "input_shape": "\u4f7f\u7528\u4f4e\u6743\u9650\u8eab\u4efd\u8bbf\u95ee\u9ad8\u6743\u9650\u5bf9\u8c61\u6216\u8de8\u79df\u6237\u8d44\u6e90\u3002",
    "expected_unsafe_behavior": "\u4f4e\u6743\u9650\u8eab\u4efd\u53ef\u8bbf\u95ee\u672c\u4e0d\u5e94\u53ef\u89c1\u7684\u6570\u636e\u6216\u64cd\u4f5c\u3002",
    "server_evidence_points": [
      "\u5e94\u7528\u65e5\u5fd7\u4e2d\u7684\u547d\u4e2d\u8def\u5f84\u3001\u9274\u6743\u51b3\u7b56\u548c\u5f02\u5e38\u6808",
      "\u53cd\u5411\u4ee3\u7406\u6216\u8fb9\u754c\u5c42\u65e5\u5fd7\u4e2d\u7684\u8bf7\u6c42\u5934\u3001\u6765\u6e90 IP \u4e0e\u8def\u7531\u51b3\u7b56"
    ],
    "browser_evidence_points": [
      "\u57fa\u7ebf\u622a\u56fe\u4e0e\u653b\u51fb\u540e\u622a\u56fe\u7684 DOM/\u89c6\u89c9\u5dee\u5f02",
      "console\u3001network \u4e0e response metadata \u4e2d\u7684\u5f02\u5e38\u4fe1\u53f7"
    ],
    "db_or_fs_evidence_points": [
      "\u6570\u636e\u5e93\u4e2d\u65b0\u589e/\u8d8a\u6743\u8bfb\u53d6\u7684\u6d4b\u8bd5\u6570\u636e",
      "\u6587\u4ef6\u7cfb\u7edf\u4e2d\u65b0\u589e\u4e0a\u4f20\u6837\u672c\u3001\u7f13\u5b58\u6761\u76ee\u6216\u8d8a\u6743\u8bfb\u53d6\u75d5\u8ff9"
    ],
    "detection_signals": [
      "WAF / reverse proxy \u5f02\u5e38\u65e5\u5fd7\u3001\u8bbf\u95ee\u65e5\u5fd7\u548c\u544a\u8b66",
      "\u5e94\u7528\u5ba1\u8ba1\u65e5\u5fd7\u4e2d\u7684\u6743\u9650\u9519\u8bef\u3001\u91cd\u5b9a\u5411\u5f02\u5e38\u3001\u6a21\u677f\u6e32\u67d3\u6216\u4e0a\u4f20\u843d\u76d8\u4e8b\u4ef6"
    ],
    "mitigation_summary": "\u4f18\u5148\u5347\u7ea7\u5230\u4fee\u590d\u7248\u672c\uff0c\u5e76\u540c\u65f6\u6536\u7d27\u8f93\u5165\u6821\u9a8c\u3001\u670d\u52a1\u7aef\u9274\u6743\u3001\u4ee3\u7406\u4fe1\u4efb\u8fb9\u754c\u3001\u6269\u5c55\u5b89\u88c5\u4fe1\u4efb\u548c\u5ba1\u8ba1\u65e5\u5fd7\u3002",
    "patch_validation_steps": [
      "\u786e\u8ba4\u76ee\u6807\u7248\u672c\u4ece `introduced=0, fixed<2.11.42, introduced=3.0.0-beta3, fixed<3.6.12, introduced=3.7.0-ea.1, fixed<3.7.0-ea.3` \u5347\u7ea7\u6216\u56de\u79fb\u5230 `2.11.42`\u3002",
      "\u4fdd\u7559\u540c\u4e00\u7ec4\u53d7\u63a7\u8f93\u5165\uff0c\u5728\u4fee\u590d\u524d\u540e\u5206\u522b\u6267\u884c\u5e76\u6bd4\u5bf9\u54cd\u5e94\u3001\u65e5\u5fd7\u4e0e\u6d4f\u89c8\u5668\u8bc1\u636e\u3002",
      "\u786e\u8ba4\u4fee\u590d\u540e\u4ec5\u4fdd\u7559\u9884\u671f\u4e1a\u52a1\u884c\u4e3a\uff0c\u4e0d\u518d\u89e6\u53d1\u8d8a\u6743\u3001\u56de\u663e\u3001\u5f02\u5e38\u6e32\u67d3\u6216\u9519\u8bef\u8bf7\u6c42\u3002",
      "\u8865\u5145 `authz-bypass` \u65cf\u81ea\u52a8\u5316\u56de\u5f52\uff0c\u907f\u514d\u540c\u7c7b\u8def\u5f84\u5728\u63d2\u4ef6\u3001\u4e3b\u9898\u6216\u4ee3\u7406\u94fe\u4e2d\u56de\u5f52\u3002"
    ],
    "lab_safety_notes": [
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      "\u7981\u6b62\u9020\u6210\u6301\u4e45\u7834\u574f\u3001\u8d8a\u6743\u4e0b\u8f7d\u771f\u5b9e\u6570\u636e\u6216\u4e0d\u53ef\u56de\u6eda side effect\u3002",
      "\u5982\u9700\u6d4f\u89c8\u5668\u8bc1\u636e\uff0c\u4fdd\u7559 baseline / proof \u4e24\u4efd\u5feb\u7167\u4ee5\u53ca console / network \u8bb0\u5f55\u3002"
    ],
    "review_state": "ready"
  },
  "verification_status": "triage-manual",
  "verification_mode": "synthetic",
  "last_verified_at": null,
  "last_run_id": null,
  "evidence_bundle": null,
  "historical_status": null,
  "latest_status": null,
  "browser_evidence": {
    "required": false,
    "present": false,
    "refs": []
  },
  "repro_profile_id": "authz-bypass-generic",
  "artifact_mode": "synthetic",
  "blocked_reason": null,
  "metadata": {
    "source_names": [
      "OSV Traefik"
    ],
    "source_kinds": [
      "osv-batch"
    ],
    "candidate_count": 1,
    "entity_ref_count": 2,
    "advisory_scope": "repo",
    "version_confidence": "high",
    "workflow_id": "traefik--GHSA-46wh-3698-f2cx--workflow"
  }
}