CVE-2026-28394
OpenClaw has a Web Fetch DoS via unbounded response parsing
Description
### Summary 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. ### Affected Packages / Versions - Package: `openclaw` (npm) - Affected versions: `<= 2026.2.14` - Fixed versions: `>= 2026.2.15` ### Impact An 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. ### Fix 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. ### Fix Commit(s) - 166cf6a3e04c7df42bea70a7ad5ce2b9df46d147 ### Release Process Note This advisory is prepared for the next npm release. Once `[email protected]` is published, publish this advisory without further edits. Thanks @xuemian168 for reporting.
How to fix CVE-2026-28394
To remediate CVE-2026-28394, upgrade the affected package to a fixed version below.
- —upgrade to 2026.2.15 or later
Is CVE-2026-28394 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 2026.2.15
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |