CVE-2026-28394
OpenClaw has a Web Fetch DoS via unbounded response parsing
Impact
### 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 `openclaw@2026.2.15` is published, publish this advisory without further edits. Thanks @xuemian168 for reporting.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | openclaw | < 2026.2.15 | 2026.2.15 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openclaw | Openclaw | before 2026.2.15 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/openclaw/openclaw/commit/166cf6a3e04c7df42bea70a7ad5ce2b9df46d147
- https://github.com/openclaw/openclaw/security/advisories/GHSA-p536-vvpp-9mc8
- https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unbounded-response-parsing-in-web-fetch-tool
- https://github.com/advisories/GHSA-p536-vvpp-9mc8
- https://github.com/openclaw/openclaw/releases/tag/v2026.2.15