{"id":"CVE-2026-35626","aliases":["EUVD-2026-21110","GHSA-36cp-mh65-x882","GHSA-rm59-992w-x2mv"],"status":"published","title":"OpenClaw \u003c 2026.3.22 - Unauthenticated Resource Exhaustion via Voice Call Webhook","description":"OpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.","severity":{"version":"4.0","score":6.9,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00513,"percentile":0.44084,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-405"],"published":"2026-03-26T19:50:41Z","modified":"2026-10-28T02:30:53Z","fixes":[{"ecosystem":"npm","package":"openclaw","fixed_in":["2026.3.22"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"openclaw","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2026.3.22"}]}]},{"source":"osv","ecosystem":"npm","package":"openclaw","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2026.3.22"}]}]}],"products":[{"vendor":"openclaw","product":"openclaw"}],"references":[{"url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-rm59-992w-x2mv","tags":["vendor-advisory","Vendor Advisory","advisory","web"]},{"url":"https://github.com/openclaw/openclaw/commit/630f1479c44f78484dfa21bb407cbe6f171dac87","tags":["patch","Patch","fix","web"]},{"url":"https://github.com/openclaw/openclaw/commit/651dc7450b68a5396a009db78ef9382633707ead","tags":["patch","Patch","fix","web"]},{"url":"https://www.vulncheck.com/advisories/openclaw-unauthenticated-resource-exhaustion-via-voice-call-webhook","tags":["third-party-advisory","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35626","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-36cp-mh65-x882"},{"url":"https://github.com/advisories/GHSA-rm59-992w-x2mv"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35626.json","tags":["advisory"]},{"url":"https://github.com/openclaw/openclaw","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-35626","title":"OpenClaw \u003c 2026.3.22 - Unauthenticated Resource Exhaustion via Voice Call Webhook","description":"OpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.","status":"published","published":"2026-04-09T21:26:58.441Z","modified":"2026-06-23T16:15:50.861Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium","assessor":"cna"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-405"],"updated_at":"2026-11-02T14:20:05.15083Z"}],"euvd":[{"id":"EUVD-2026-21110","description":"OpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.","status":"published","published":"2026-04-09T21:26:58Z","modified":"2026-06-23T16:15:50Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T18:20:31.896888Z"}],"ghsa":[{"id":"GHSA-36cp-mh65-x882","title":"Duplicate Advisory: OpenClaw is vulnerable to unauthenticated resource exhaustion through its voice call webhook handling","description":"### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-rm59-992w-x2mv. This link is maintained to preserve external references.\n\n### Original Description\nOpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.","status":"withdrawn","published":"2026-04-10T00:30:30Z","modified":"2026-04-10T20:18:59Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-405"],"updated_at":"2026-11-02T14:39:53.087746Z"},{"id":"GHSA-rm59-992w-x2mv","title":"OpenClaw is vulnerable to unauthenticated resource exhaustion through its voice call webhook handling","description":"## Summary\nVoice Call webhook handling buffered request bodies before provider signature checks, enabling bounded unauthenticated resource exhaustion.\n\n## Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Affected: \u003c 2026.3.22\n- Fixed: \u003e= 2026.3.22\n- Latest released tag checked: `v2026.3.23-2` (`630f1479c44f78484dfa21bb407cbe6f171dac87`)\n- Latest published npm version checked: `2026.3.23-2`\n\n## Fix Commit(s)\n- `651dc7450b68a5396a009db78ef9382633707ead`\n\n## Release Status\nThe fix shipped in `v2026.3.22` and remains present in `v2026.3.23` and `v2026.3.23-2`.\n\n## Code-Level Confirmation\n- extensions/voice-call/src/webhook.ts now enforces header gating and shared pre-auth body caps before reading attacker-controlled request bodies.\n- extensions/voice-call/src/webhook.test.ts ships regression coverage for missing-signature, oversize, and timeout pre-auth webhook cases.\n\nOpenClaw thanks @SEORY0 for reporting.","status":"published","published":"2026-03-26T19:50:41Z","modified":"2026-04-10T20:19:04Z","cvss":[{"version":"4.0","score":6.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:39:53.087746Z"}],"nvd":[{"id":"CVE-2026-35626","description":"OpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.","status":"published","published":"2026-04-09T22:16:31.047Z","modified":"2026-06-17T10:40:53.533Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-405"],"updated_at":"2026-11-02T14:12:13.902911Z"}],"osv":[{"id":"CVE-2026-35626","title":"OpenClaw \u003c 2026.3.22 - Unauthenticated Resource Exhaustion via Voice Call Webhook","description":"OpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.","status":"published","published":"2026-04-09T21:26:58.441Z","modified":"2026-10-28T02:30:53.136978752Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium"}],"cwes":["CWE-405"],"updated_at":"2026-11-02T15:45:02.673625Z"},{"id":"GHSA-36cp-mh65-x882","title":"Duplicate Advisory: OpenClaw is vulnerable to unauthenticated resource exhaustion through its voice call webhook handling","description":"### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-rm59-992w-x2mv. This link is maintained to preserve external references.\n\n### Original Description\nOpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.","status":"withdrawn","published":"2026-04-10T00:30:30Z","modified":"2026-04-10T20:33:48.135007Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"},{"version":"4.0","score":6.9,"vector":"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","level":"medium"}],"cwes":["CWE-405"],"updated_at":"2026-11-02T15:46:35.406455Z"},{"id":"GHSA-rm59-992w-x2mv","title":"OpenClaw is vulnerable to unauthenticated resource exhaustion through its voice call webhook handling","description":"## Summary\nVoice Call webhook handling buffered request bodies before provider signature checks, enabling bounded unauthenticated resource exhaustion.\n\n## Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Affected: \u003c 2026.3.22\n- Fixed: \u003e= 2026.3.22\n- Latest released tag checked: `v2026.3.23-2` (`630f1479c44f78484dfa21bb407cbe6f171dac87`)\n- Latest published npm version checked: `2026.3.23-2`\n\n## Fix Commit(s)\n- `651dc7450b68a5396a009db78ef9382633707ead`\n\n## Release Status\nThe fix shipped in `v2026.3.22` and remains present in `v2026.3.23` and `v2026.3.23-2`.\n\n## Code-Level Confirmation\n- extensions/voice-call/src/webhook.ts now enforces header gating and shared pre-auth body caps before reading attacker-controlled request bodies.\n- extensions/voice-call/src/webhook.test.ts ships regression coverage for missing-signature, oversize, and timeout pre-auth webhook cases.\n\nOpenClaw thanks @SEORY0 for reporting.","status":"published","published":"2026-03-26T19:50:41Z","modified":"2026-04-10T20:42:17.421105Z","cvss":[{"version":"4.0","score":6.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:46:55.877614Z"}]}}