{"id":"CVE-2026-29606","aliases":["GHSA-c37p-4qqg-3p76"],"url":"https://o3.security/vulnerability/CVE-2026-29606","summary":"OpenClaw < 2026.2.14 - Webhook Signature Verification Bypass via ngrok Loopback Compatibility","details":"## Summary\n\nA Twilio webhook signature-verification bypass in the voice-call extension could allow unauthenticated webhook requests when a specific ngrok free-tier compatibility option is enabled.\n\n## Impact\n\nThis issue is limited to configurations that explicitly enable and expose the voice-call webhook endpoint.\n\nNot affected by default:\n- The voice-call extension is optional and disabled by default.\n- The bypass only applied when `tunnel.allowNgrokFreeTierLoopbackBypass` was explicitly enabled.\n- Exploitation required the webhook to be reachable (typically via a public ngrok URL during development).\n\nWorst case (when exposed and the option was enabled):\n- An external attacker could send forged requests to the publicly reachable webhook endpoint that would be accepted without a valid `X-Twilio-Signature`.\n- This could result in unauthorized webhook event handling (integrity) and request flooding (availability).\n\n## Affected Packages / Versions\n\n- Package: `openclaw` (npm)\n- Affected versions: `<= 2026.2.13` (latest published as of 2026-02-14)\n- Patched versions: `>= 2026.2.14` (planned next release; pending publish)\n\n## Fix\n\n`allowNgrokFreeTierLoopbackBypass` no longer bypasses signature verification. It only enables trusting forwarded headers on loopback so the public ngrok URL can be reconstructed for correct signature validation.\n\nFix commit(s):\n- ff11d8793b90c52f8d84dae3fbb99307da51b5c9\n\nThanks @p80n-sec for reporting.","published":"2026-03-05T22:00:05.680Z","modified":"2026-08-12T03:51:37.556306542Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"openclaw","fixedVersion":"2026.2.14"}],"fix":{"url":"https://github.com/openclaw/openclaw/commit/ff11d8793b90c52f8d84dae3fbb99307da51b5c9","label":"openclaw/openclaw@ff11d87"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29606.json"},{"type":"ADVISORY","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-c37p-4qqg-3p76"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29606"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openclaw-webhook-signature-verification-bypass-via-ngrok-loopback-compatibility"},{"type":"FIX","url":"https://github.com/openclaw/openclaw/commit/ff11d8793b90c52f8d84dae3fbb99307da51b5c9"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"},{"type":"WEB","url":"https://github.com/openclaw/openclaw/releases/tag/v2026.2.14"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:37.556306542Z"}}