Vulnerability · Published Mar 5, 2026 · Assigned by VulnCheck

CVE-2026-28478OpenClaw < 2026.2.13 - Denial of Service via Unbounded Webhook Request Body Buffering

High 7.5

In plain English

A high-severity resource allocation without limits in OpenClaw from OpenClaw. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 56.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	clawdbot	no fix listed	GHSA-q447-rj3r-2cgh
npm	openclaw	2026.2.13	GHSA-q447-rj3r-2cgh

Affected products (as reported)

Vendor	Product	Versions
OpenClaw	OpenClaw	0 – before 2026.2.13

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

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