{"id":"CVE-2026-41405","aliases":["EUVD-2026-26112","GHSA-p464-m8x6-vhv8"],"status":"published","title":"OpenClaw \u003c 2026.3.31 - Resource Exhaustion via Unauthenticated MS Teams Webhook Body Parsing","description":"OpenClaw before 2026.3.31 parses MS Teams webhook request bodies before performing JWT validation, allowing unauthenticated attackers to trigger resource exhaustion. Remote attackers can send malicious Teams webhook payloads to exhaust server resources by bypassing authentication checks.","severity":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00481,"percentile":0.41953,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-408"],"published":"2026-04-03T02:54:38Z","modified":"2026-10-28T02:30:50Z","fixes":[{"ecosystem":"npm","package":"openclaw","fixed_in":["2026.3.31"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"openclaw","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2026.3.28"},{"fixed":"2026.3.31"}]}]},{"source":"osv","ecosystem":"npm","package":"openclaw","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2026.3.31"}]}]}],"products":[{"vendor":"openclaw","product":"openclaw"}],"references":[{"url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-p464-m8x6-vhv8","tags":["vendor-advisory","Vendor Advisory","advisory","web"]},{"url":"https://github.com/openclaw/openclaw/commit/3834d47099dd13c8244ed6de8b9ea9855c553623","tags":["patch","Patch","fix","web"]},{"url":"https://www.vulncheck.com/advisories/openclaw-resource-exhaustion-via-unauthenticated-ms-teams-webhook-body-parsing","tags":["third-party-advisory","Third Party Advisory","advisory","web"]},{"url":"https://github.com/openclaw/openclaw/releases/tag/v2026.3.31","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41405","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-p464-m8x6-vhv8"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41405.json","tags":["advisory"]},{"url":"https://github.com/openclaw/openclaw","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-41405","title":"OpenClaw \u003c 2026.3.31 - Resource Exhaustion via Unauthenticated MS Teams Webhook Body Parsing","description":"OpenClaw before 2026.3.31 parses MS Teams webhook request bodies before performing JWT validation, allowing unauthenticated attackers to trigger resource exhaustion. Remote attackers can send malicious Teams webhook payloads to exhaust server resources by bypassing authentication checks.","status":"published","published":"2026-04-28T18:10:03.317Z","modified":"2026-04-29T12:16:55.183Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-408"],"updated_at":"2026-11-02T13:41:08.498858Z"}],"euvd":[{"id":"EUVD-2026-26112","description":"OpenClaw before 2026.3.31 parses MS Teams webhook request bodies before performing JWT validation, allowing unauthenticated attackers to trigger resource exhaustion. Remote attackers can send malicious Teams webhook payloads to exhaust server resources by bypassing authentication checks.","status":"published","published":"2026-04-28T18:10:03Z","modified":"2026-04-29T12:16:55Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T19:05:20.318185Z"}],"ghsa":[{"id":"GHSA-p464-m8x6-vhv8","title":"OpenClaw: MS Teams webhook parses body before JWT validation, enabling unauthenticated resource exhaustion","description":"## Summary\nMS Teams webhook parses body before JWT validation, enabling unauthenticated resource exhaustion\n\n## Current Maintainer Triage\n- Status: open\n- Normalized severity: medium\n- Assessment: v2026.3.28 still parses Teams JSON after only a Bearer-prefix gate and before real JWT validation, and the auth-before-parse fix is not yet shipped.\n\n## Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Latest published npm version: `2026.3.31`\n- Vulnerable version range: `\u003c=2026.3.28`\n- Patched versions: `\u003e= 2026.3.31`\n- First stable tag containing the fix: `v2026.3.31`\n\n## Fix Commit(s)\n- `3834d47099dd13c8244ed6de8b9ea9855c553623` — 2026-03-30T13:46:40+01:00\n\nOpenClaw thanks @AntAISecurityLab for reporting.","status":"published","published":"2026-04-03T02:54:38Z","modified":"2026-05-06T02:40:46Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400","CWE-408"],"updated_at":"2026-11-02T14:40:01.917039Z"}],"nvd":[{"id":"CVE-2026-41405","description":"OpenClaw before 2026.3.31 parses MS Teams webhook request bodies before performing JWT validation, allowing unauthenticated attackers to trigger resource exhaustion. Remote attackers can send malicious Teams webhook payloads to exhaust server resources by bypassing authentication checks.","status":"published","published":"2026-04-28T19:37:44.09Z","modified":"2026-06-17T10:46:40.41Z","cvss":[{"version":"4.0","score":8.7,"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: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":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-408"],"updated_at":"2026-11-02T14:12:16.252509Z"}],"osv":[{"id":"CVE-2026-41405","title":"OpenClaw \u003c 2026.3.31 - Resource Exhaustion via Unauthenticated MS Teams Webhook Body Parsing","description":"OpenClaw before 2026.3.31 parses MS Teams webhook request bodies before performing JWT validation, allowing unauthenticated attackers to trigger resource exhaustion. Remote attackers can send malicious Teams webhook payloads to exhaust server resources by bypassing authentication checks.","status":"published","published":"2026-04-28T18:10:03.317Z","modified":"2026-10-28T02:30:50.125028149Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-408"],"updated_at":"2026-11-02T15:45:03.764807Z"},{"id":"GHSA-p464-m8x6-vhv8","title":"OpenClaw: MS Teams webhook parses body before JWT validation, enabling unauthenticated resource exhaustion","description":"## Summary\nMS Teams webhook parses body before JWT validation, enabling unauthenticated resource exhaustion\n\n## Current Maintainer Triage\n- Status: open\n- Normalized severity: medium\n- Assessment: v2026.3.28 still parses Teams JSON after only a Bearer-prefix gate and before real JWT validation, and the auth-before-parse fix is not yet shipped.\n\n## Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Latest published npm version: `2026.3.31`\n- Vulnerable version range: `\u003c=2026.3.28`\n- Patched versions: `\u003e= 2026.3.31`\n- First stable tag containing the fix: `v2026.3.31`\n\n## Fix Commit(s)\n- `3834d47099dd13c8244ed6de8b9ea9855c553623` — 2026-03-30T13:46:40+01:00\n\nOpenClaw thanks @AntAISecurityLab for reporting.","status":"published","published":"2026-04-03T02:54:38Z","modified":"2026-05-06T02:51:20.087107Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-400","CWE-408"],"updated_at":"2026-11-02T15:46:52.534897Z"}]}}