{"id":"CVE-2026-42437","aliases":["EUVD-2026-27257","GHSA-vw3h-q6xq-jjm5"],"status":"published","title":"OpenClaw 2026.4.9 \u003c 2026.4.10 - Denial of Service via Oversized WebSocket Frames in Voice-call Realtime Path","description":"OpenClaw versions 2026.4.9 before 2026.4.10 contain a denial of service vulnerability in the voice-call realtime WebSocket path that accepts oversized frames without proper validation. Remote attackers can send oversized WebSocket frames to cause service unavailability for deployments exposing the voice-call realtime WebSocket path.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00412,"percentile":0.3582,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-770"],"published":"2026-04-17T21:48:36Z","modified":"2026-10-28T02:30:49Z","fixes":[{"ecosystem":"npm","package":"openclaw","fixed_in":["2026.4.10"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"openclaw","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2026.4.9"},{"fixed":"2026.4.10"}]}]},{"source":"osv","ecosystem":"npm","package":"openclaw","ranges":[{"type":"SEMVER","events":[{"introduced":"2026.4.9"},{"fixed":"2026.4.10"}]}]}],"products":[{"vendor":"openclaw","product":"openclaw"}],"references":[{"url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-vw3h-q6xq-jjm5","tags":["vendor-advisory","advisory","web"]},{"url":"https://github.com/openclaw/openclaw/commit/afadb7dae6738819ad9c7d2597ace0516957d20e","tags":["patch","fix","web"]},{"url":"https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-oversized-websocket-frames-in-voice-call-realtime-path","tags":["third-party-advisory","advisory","web"]},{"url":"https://github.com/openclaw/openclaw/pull/63890","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42437","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-vw3h-q6xq-jjm5"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42437.json","tags":["advisory"]},{"url":"https://github.com/openclaw/openclaw","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-42437","title":"OpenClaw 2026.4.9 \u003c 2026.4.10 - Denial of Service via Oversized WebSocket Frames in Voice-call Realtime Path","description":"OpenClaw versions 2026.4.9 before 2026.4.10 contain a denial of service vulnerability in the voice-call realtime WebSocket path that accepts oversized frames without proper validation. Remote attackers can send oversized WebSocket frames to cause service unavailability for deployments exposing the voice-call realtime WebSocket path.","status":"published","published":"2026-05-05T11:24:55.977Z","modified":"2026-05-26T11:52:19.047Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/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-770"],"updated_at":"2026-11-02T13:40:35.004553Z"}],"euvd":[{"id":"EUVD-2026-27257","description":"OpenClaw versions 2026.4.9 before 2026.4.10 contain a denial of service vulnerability in the voice-call realtime WebSocket path that accepts oversized frames without proper validation. Remote attackers can send oversized WebSocket frames to cause service unavailability for deployments exposing the voice-call realtime WebSocket path.","status":"published","published":"2026-05-05T11:24:55Z","modified":"2026-05-26T11:52:19Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:21:07.775399Z"}],"ghsa":[{"id":"GHSA-vw3h-q6xq-jjm5","title":"OpenClaw: Voice-call realtime WebSocket accepted oversized frames","description":"## Summary\n\nVoice-call realtime WebSocket accepted oversized frames.\n\n## Affected Packages / Versions\n\n- Package: `openclaw`\n- Ecosystem: npm\n- Affected versions: `\u003e= 2026.4.9 \u003c 2026.4.10`\n- Patched versions: `\u003e= 2026.4.10`\n\n## Impact\n\nThe voice-call realtime WebSocket path could accept oversized frames, creating a remote availability risk for deployments exposing that webhook path.\n\n## Technical Details\n\nThe fix rejects oversized realtime WebSocket frames before processing them.\n\n## Fix\n\nThe issue was fixed in #63890. The first stable tag containing the fix is `v2026.4.10`, and `openclaw@2026.4.14` includes the fix.\n\n## Fix Commit(s)\n\n- `afadb7dae6738819ad9c7d2597ace0516957d20e`\n- PR: #63890\n\n## Release Process Note\n\nUsers should upgrade to `openclaw` 2026.4.10 or newer. The latest npm release, `2026.4.14`, already includes the fix.\n\n## Reporters\n\nThanks to G0odUser from ADLab of VenusTech\nThanks to @zsxsoft, with sponsorship from @KeenSecurityLab and @qclawer for reporting this issue.","status":"published","published":"2026-04-17T21:48:36Z","modified":"2026-06-08T23:25:35Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/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-770"],"updated_at":"2026-11-02T14:40:20.187636Z"}],"nvd":[{"id":"CVE-2026-42437","description":"OpenClaw versions 2026.4.9 before 2026.4.10 contain a denial of service vulnerability in the voice-call realtime WebSocket path that accepts oversized frames without proper validation. Remote attackers can send oversized WebSocket frames to cause service unavailability for deployments exposing the voice-call realtime WebSocket path.","status":"published","published":"2026-05-05T12:16:18.19Z","modified":"2026-06-17T10:47:50.473Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/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-770"],"updated_at":"2026-11-02T14:12:17.022502Z"}],"osv":[{"id":"CVE-2026-42437","title":"OpenClaw 2026.4.9 \u003c 2026.4.10 - Denial of Service via Oversized WebSocket Frames in Voice-call Realtime Path","description":"OpenClaw versions 2026.4.9 before 2026.4.10 contain a denial of service vulnerability in the voice-call realtime WebSocket path that accepts oversized frames without proper validation. Remote attackers can send oversized WebSocket frames to cause service unavailability for deployments exposing the voice-call realtime WebSocket path.","status":"published","published":"2026-05-05T11:24:55.977Z","modified":"2026-10-28T02:30:49.642039987Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:45:04.117819Z"},{"id":"GHSA-vw3h-q6xq-jjm5","title":"OpenClaw: Voice-call realtime WebSocket accepted oversized frames","description":"## Summary\n\nVoice-call realtime WebSocket accepted oversized frames.\n\n## Affected Packages / Versions\n\n- Package: `openclaw`\n- Ecosystem: npm\n- Affected versions: `\u003e= 2026.4.9 \u003c 2026.4.10`\n- Patched versions: `\u003e= 2026.4.10`\n\n## Impact\n\nThe voice-call realtime WebSocket path could accept oversized frames, creating a remote availability risk for deployments exposing that webhook path.\n\n## Technical Details\n\nThe fix rejects oversized realtime WebSocket frames before processing them.\n\n## Fix\n\nThe issue was fixed in #63890. The first stable tag containing the fix is `v2026.4.10`, and `openclaw@2026.4.14` includes the fix.\n\n## Fix Commit(s)\n\n- `afadb7dae6738819ad9c7d2597ace0516957d20e`\n- PR: #63890\n\n## Release Process Note\n\nUsers should upgrade to `openclaw` 2026.4.10 or newer. The latest npm release, `2026.4.14`, already includes the fix.\n\n## Reporters\n\nThanks to G0odUser from ADLab of VenusTech\nThanks to @zsxsoft, with sponsorship from @KeenSecurityLab and @qclawer for reporting this issue.","status":"published","published":"2026-04-17T21:48:36Z","modified":"2026-06-08T23:30:14.364614357Z","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":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-400","CWE-770"],"updated_at":"2026-11-02T15:46:57.694388Z"}]}}