{"id":"CVE-2026-41399","aliases":["GHSA-f44p-c7w9-7xr7"],"url":"https://o3.security/vulnerability/CVE-2026-41399","summary":"OpenClaw < 2026.3.28 - Denial of Service via Unbounded Pre-auth WebSocket Upgrades","details":"## Summary\n\nThe gateway accepted unbounded concurrent unauthenticated WebSocket upgrades before allocating them to an authenticated session budget.\n\n## Impact\n\nAn unauthenticated network attacker could consume socket and worker capacity and disrupt WebSocket availability for legitimate clients.\n\n## Affected Component\n\n`src/gateway/server-http.ts, src/gateway/server/preauth-connection-budget.ts`\n\n## Fixed Versions\n\n- Affected: `<= 2026.3.24`\n- Patched: `>= 2026.3.28`\n- Latest stable `2026.3.28` contains the fix.\n\n## Fix\n\nFixed by commit `cb5f7e201f` (`gateway: cap concurrent pre-auth websocket upgrades`).\n\nDiscovered by：Topsec AlphaLab (wang dong)","published":"2026-04-28T18:09:57.805Z","modified":"2026-08-12T03:51:28.655588732Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"openclaw","fixedVersion":"2026.3.28"}],"fix":{"url":"https://github.com/openclaw/openclaw/commit/cb5f7e201f3f86ad70e199ef850e636b4cc457ba","label":"openclaw/openclaw@cb5f7e2"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41399.json"},{"type":"ADVISORY","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-f44p-c7w9-7xr7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41399"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unbounded-pre-auth-websocket-upgrades"},{"type":"WEB","url":"https://github.com/openclaw/openclaw/commit/cb5f7e201f3f86ad70e199ef850e636b4cc457ba"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.655588732Z"}}