Anubis: Policy bypass via client controlled X-Original-URI header

{
  "id": "ba3dbae6e37fb548a3425ce27ecf42ac8a167b2ed0718b059a84d2a2354a4ef1",
  "url": "https://osv.dev/vulnerability/GHSA-6wcg-mqvh-fcvg",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Anubis: Policy bypass via client controlled X-Original-URI header",
    "summary": "Any HTTP client can bypass Anubis bot protection on the default configuration by adding a single request header. No challenge needs to be solved. Affected versions: v1.22.0 through v1.25.0 (introduced in commit d1d631a, PR #1015) The root cause is in `lib/policy/checker.go`, `PathChecker.Check()`: ```go func (pc *PathChecker) Check(r *http.Request) (bool, error) { originalUrl := r.Header.Get(\"X-Original-URI\") if originalUrl != \"\" { if pc.regexp.MatchString(originalUrl) { return true, nil } } if pc.regexp.MatchString(r.URL.Path) { return true, nil } return false, nil } ``` The header value comes directly from the client request. The middleware chain never strips it. In reverse proxy mode an attacker fully controls it. The default policy imports `data/common/keep-internet-working.yaml`, which contains path-only ALLOW rules with no other conditions: ```yaml - name: well-known path_regex: ^/\\.well-known/.*$ action: ALLOW ``` When `X-Original-URI` matches one of those regexes, the rule fires as ALLOW and the request is forwarded upstream without any challenge or JWT check. # Proof of concept Normal request, gets challenged: ``` curl -s https://anubis.techaro.lol/ | grep -o \".*\" ``` Bypass, gets upstream content: ``` curl -s -H \"X-Original-URI: /.well-known/x\" https://anubis.techaro.lol/ | grep -o \".*\" ``` The first command returns the Anubis challenge page title. The second returns the real site title directly, with no cookie set and no challenge issued. Verified live against anub",
    "evidence": "osv:GHSA-6wcg-mqvh-fcvg",
    "products": [
      {
        "name": {
          "value": "github.com/TecharoHQ/anubis",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.26.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-6wcg-mqvh-fcvg",
      "aliases": [
        "CVE-2026-62314",
        "GHSA-6wcg-mqvh-fcvg",
        "GO-2026-6639"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "1.22.0"
                },
                {
                  "fixed": "1.26.0"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/TecharoHQ/anubis",
            "purl": "pkg:golang/github.com/TecharoHQ/anubis",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-6wcg-mqvh-fcvg/GHSA-6wcg-mqvh-fcvg.json"
          }
        }
      ],
      "modified": "2026-10-07T17:55:39.900896867Z",
      "provider": "osv",
      "references": [
        "https://github.com/TecharoHQ/anubis/security/advisories/GHSA-6wcg-mqvh-fcvg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-62314",
        "https://github.com/TecharoHQ/anubis/pull/1630",
        "https://github.com/TecharoHQ/anubis/commit/276b537776b281b1c4e01421435bc03ade3d8fc4",
        "https://github.com/TecharoHQ/anubis",
        "https://github.com/TecharoHQ/anubis/releases/tag/v1.26.0-pre1"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-07-15T22:17:38Z",
        "github_reviewed_at": "2026-10-02T18:22:08Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-62314",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 97120,
  "published_at": "2026-10-02T18:22:08+00:00"
}

{
  "id": "058a0546bb24a318a3cca13002bf6593dd08e928e649fabccacee9516c539f7a",
  "url": "https://osv.dev/vulnerability/GO-2026-6639",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Anubis: Policy bypass via client controlled X-Original-URI header in github.com/TecharoHQ/anubis",
    "summary": "Anubis: Policy bypass via client controlled X-Original-URI header in github.com/TecharoHQ/anubis",
    "evidence": "osv:GO-2026-6639",
    "products": [
      {
        "name": {
          "value": "github.com/TecharoHQ/anubis",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.26.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "GO-2026-6639",
      "aliases": [
        "CVE-2026-62314",
        "GHSA-6wcg-mqvh-fcvg",
        "GO-2026-6639"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "1.22.0"
                },
                {
                  "fixed": "1.26.0"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/TecharoHQ/anubis",
            "purl": "pkg:golang/github.com/TecharoHQ/anubis",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://vuln.go.dev/ID/GO-2026-6639.json"
          },
          "ecosystem_specific": {}
        }
      ],
      "modified": "2026-10-07T17:45:12.474473706Z",
      "provider": "osv",
      "references": [
        "https://github.com/TecharoHQ/anubis/security/advisories/GHSA-6wcg-mqvh-fcvg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-62314",
        "https://github.com/TecharoHQ/anubis/commit/276b537776b281b1c4e01421435bc03ade3d8fc4",
        "https://github.com/TecharoHQ/anubis/pull/1630",
        "https://github.com/TecharoHQ/anubis/releases/tag/v1.26.0-pre1"
      ],
      "provider_metadata": {
        "url": "https://pkg.go.dev/vuln/GO-2026-6639",
        "review_status": "UNREVIEWED"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-62314",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 97098,
  "published_at": "2026-10-07T14:10:14+00:00"
}