{"id":"CVE-2026-41351","aliases":["GHSA-37v6-fxx8-xjmx"],"url":"https://o3.security/vulnerability/CVE-2026-41351","summary":"OpenClaw < 2026.3.31 - Webhook Replay Detection Bypass via Base64 Signature Re-encoding","details":"OpenClaw before 2026.3.31 contains a replay detection bypass vulnerability in webhook signature handling that treats Base64 and Base64URL encoded signatures as distinct requests. Attackers can re-encode Telnyx webhook signatures to bypass replay detection while maintaining valid signature verification.","published":"2026-04-23T21:58:11.440Z","modified":"2026-08-09T03:46:26.162431319Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"openclaw","fixedVersion":"2026.3.31"}],"fix":{"url":"https://github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a","label":"openclaw/openclaw@ad77666"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41351.json"},{"type":"ADVISORY","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-37v6-fxx8-xjmx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41351"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openclaw-webhook-replay-detection-bypass-via-base64-signature-re-encoding"},{"type":"FIX","url":"https://github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-09T03:46:26.162431319Z"}}