CVE-2026-35626
Published: 09 April 2026
Summary
CVE-2026-35626 is a medium-severity Amplification (CWE-405) vulnerability in Openclaw Openclaw. Its CVSS base score is 6.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 31.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-21110
Vulnerability details
OpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unauthenticated webhook endpoint allows resource exhaustion via large requests before auth, directly enabling public-facing app exploitation (T1190) and application exhaustion DoS (T1499.003/004).
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Reduces impact of amplification attacks that overwhelm the primary site by allowing operations to shift to an equivalent alternate site.
Alternate services reduce the impact of amplification attacks that exhaust primary telecommunications resources.
Amplification attacks that exhaust the primary path are mitigated by the existence of an independent alternate path for command traffic.
Employs controls that mitigate amplification attacks causing asymmetric resource use.
Limits amplification effects by controlling how resources are allocated under high-volume or recursive load.