Service interruption via unbounded webhook body buffering
Published Mar 5, 2026 · Updated Mar 5, 2026
Denial of service in OpenClaw before 2026.2.13 allows remote attackers to interrupt webhook processing via oversized or slow requests. Multiple webhook handlers buffer request bodies without consistently enforcing maximum byte counts and read timeouts, while some SDK handlers parse the streams internally. Exploitation requires a reachable webhook endpoint but no authentication, and the resulting memory and request-handler pressure degrades availability without reported data access or modification.
Summary
What happened
Denial of service in OpenClaw before 2026.2.13 allows remote attackers to interrupt webhook processing via oversized or slow requests. Multiple webhook handlers buffer request bodies without consistently enforcing maximum byte counts and read timeouts, while some SDK handlers parse the streams internally. Exploitation requires a reachable webhook endpoint but no authentication, and the resulting memory and request-handler pressure degrades availability without reported data access or modification.
The record
- CVE
- CVE-2026-28478
- Published
- Mar 5, 2026
- Updated
- Mar 5, 2026
- Vendor
- OpenClaw Foundation
- Product
- OpenClaw
- Classifications
- CWE-770, CWE-400, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 5, 2026CVE publishedPublication date reported by the CVE source.
- Mar 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <2026.2.13
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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