The web_fetch tool could be used to crash the OpenClaw Gateway process (OOM / resource exhaustion) by fetching and attempting to parse attacker-controlled web pages with oversized response bodies or pathological HTML nesting.
openclaw (npm)<= 2026.2.14>= 2026.2.15An attacker can social-engineer a user (or any automation that uses web_fetch) into fetching a malicious URL that returns extremely large or deeply nested HTML. The Gateway may exhaust memory or become unresponsive, causing a denial of service.
The Gateway now caps the downloaded response body size before any HTML parsing and adds additional guards to avoid running Readability/DOM parsing on pathological HTML.
This advisory is prepared for the next npm release. Once [email protected] is published, publish this advisory without further edits.
Thanks @xuemian168 for reporting.
| Score | Percentile |
|---|---|
| 0.22% | 45.25% |
| Base score | Version | Severity | Vector |
|---|---|---|---|
| 6.5 | 3.1 | — |
|
| Type | Value |
|---|---|
| GHSA | GHSA-p536-vvpp-9mc8 ↗ |
| CVE | CVE-2026-28394 ↗ |
| CWE id | Name |
|---|---|
| CWE-400 | Uncontrolled Resource Consumption |
Vulnerable version ranges and first patched releases as published by GitHub.
| Ecosystem | Package | Vulnerable range | First patched | Vulnerable functions |
|---|---|---|---|---|
| npm | openclaw | < 2026.2.15 | 2026.2.15 | — |