PinchTab: Unapplied Rate Limiting Middleware Allows Unbounded Brute-Force of API Token

{
  "id": "7a22659f1b2cd1769306b260eb3acf7c5aea0a74dea60febf11d2ee58d594cb1",
  "url": "https://osv.dev/vulnerability/CVE-2026-33621",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PinchTab: Unapplied Rate Limiting Middleware Allows Unbounded Brute-Force of API Token",
    "summary": "PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. PinchTab `v0.7.7` through `v0.8.4` contain incomplete request-throttling protections for auth-checkable endpoints. In `v0.7.7` through `v0.8.3`, a fully implemented `RateLimitMiddleware` existed in `internal/handlers/middleware.go` but was not inserted into the production HTTP handler chain, so requests were not subject to the intended per-IP throttle. In the same pre-`v0.8.4` range, the original limiter also keyed clients using `X-Forwarded-For`, which would have allowed client-controlled header spoofing if the middleware had been enabled. `v0.8.4` addressed those two issues by wiring the limiter into the live handler chain and switching the key to the immediate peer IP, but it still exempted `/health` and `/metrics` from rate limiting even though `/health` remained an auth-checkable endpoint when a token was configured. This issue weakens defense in depth for deployments where an attacker can reach the API, especially if a weak human-chosen token is used. It is not a direct authentication bypass or token disclosure issue by itself. PinchTab is documented as local-first by default and uses `127.0.0.1` plus a generated random token in the recommended setup. PinchTab's default deployment model is a local-first, user-controlled environment between the user and their agents; wider exposure is an intentional operator choice. This lowers practical risk in the default configuration, even",
    "evidence": "osv:CVE-2026-33621",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-33621",
      "aliases": [
        "CVE-2026-33621",
        "GHSA-j65m-hv65-r264",
        "GO-2026-4821"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pinchtab/pinchtab",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3b64a0565d1c4b7118da7b3912f0316775097240"
                },
                {
                  "fixed": "ce7efa1c3d564cafcf094fcdbd22ffdd7863e71d"
                },
                {
                  "fixed": "c619c43a4f29d1d1a481e859c193baf78e0d648b"
                },
                {
                  "fixed": "60ce4448c30d3c68edf790875bc1167d7a7b2308"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:pinchtab:pinchtab:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.7.7"
                      },
                      {
                        "fixed": "0.8.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c619c43a4f29d1d1a481e859c193baf78e0d648b"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "60ce4448c30d3c68edf790875bc1167d7a7b2308"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.8.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.8",
            "v0.7.7"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33621.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.953025507Z",
      "provider": "osv",
      "references": [
        "https://github.com/pinchtab/pinchtab/releases/tag/v0.8.4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33621.json",
        "https://github.com/pinchtab/pinchtab/security/advisories/GHSA-j65m-hv65-r264",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33621",
        "https://github.com/pinchtab/pinchtab/commit/c619c43a4f29d1d1a481e859c193baf78e0d648b"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-290",
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33621.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33621",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510751,
  "published_at": "2026-03-26T20:42:12.692+00:00"
}