CVE-2026-28478 | THREATINT

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.

PUBLISHED Reserved 2026-02-27 | Published 2026-03-05 | Updated 2026-03-05 | Assigner VulnCheck

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

Allocation of Resources Without Limits or Throttling

Product status

Default status

unaffected

Any version before 2026.2.13

affected

Credits

Vincent Koc (@vincentkoc) reporter

References

github.com/...enclaw/security/advisories/GHSA-q447-rj3r-2cgh (GitHub Security Advisory (GHSA-q447-rj3r-2cgh)) vendor-advisory

github.com/...ommit/3cbcba10cf30c2ffb898f0d8c7dfb929f15f8930 (Patch Commit) patch

www.vulncheck.com/...nbounded-webhook-request-body-buffering (VulnCheck Advisory: OpenClaw < 2026.2.13 - Denial of Service via Unbounded Webhook Request Body Buffering) third-party-advisory

cve.org (CVE-2026-28478)

nvd.nist.gov (CVE-2026-28478)

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