{"id":"CVE-2026-35640","aliases":["GHSA-3h52-cx59-c456"],"url":"https://o3.security/vulnerability/CVE-2026-35640","summary":"OpenClaw < 2026.3.25 - Denial of Service via Unauthenticated Webhook Request Parsing","details":"## Summary\n\nFeishu webhook reads and parses unauthenticated request bodies before signature validation\n\n## Affected Packages / Versions\n\n- Package: `openclaw`\n- Affected versions: `<= 2026.3.24`\n- First patched version: `2026.3.25`\n- Latest published npm version at verification time: `2026.3.24`\n\n## Details\n\nFeishu webhook handling previously parsed JSON before signature validation, which let unauthenticated callers force full JSON parsing work before rejection. Commit `5e8cb22176e9235e224be0bc530699261eb60e53` reads the raw request body, validates the signature first, and only then parses JSON.\n\nVerified vulnerable on tag `v2026.3.24` and fixed on `main` by commit `5e8cb22176e9235e224be0bc530699261eb60e53`.\n\n## Fix Commit(s)\n\n- `5e8cb22176e9235e224be0bc530699261eb60e53`","published":"2026-04-09T21:27:08.792Z","modified":"2026-10-28T02:31:10.625838275Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"openclaw","fixedVersion":"2026.3.28"}],"fix":{"url":"https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53","label":"openclaw/openclaw@5e8cb22"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35640.json"},{"type":"ADVISORY","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35640"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing"},{"type":"FIX","url":"https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:31:10.625838275Z"}}