CVE-2026-28478

OpenClaw < 2026.2.13 - Denial of Service via Unbounded Webhook Request Body Buffering

State: Published
Severity: 8.7 High
Published: Mar 5, 2026
Updated: Mar 9, 2026
Reserved: Feb 27, 2026

Description

OpenClaw versions prior to 2026.2.13 contain a denial of service vulnerability in webhook handlers that buffer request bodies without strict byte or time limits. Remote unauthenticated attackers can send oversized JSON payloads or slow uploads to webhook endpoints causing memory pressure and availability degradation.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
OpenClawOpenClaw	before 2026.2.13Affected

References

GitHub Security Advisory (GHSA-q447-rj3r-2cgh)vendor-advisory
Patch Commitpatch
VulnCheck Advisory: OpenClaw < 2026.2.13 - Denial of Service via Unbounded Webhook Request Body Bufferingthird-party-advisory

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