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Description

OpenClaw before 2026.3.25 parses JSON request bodies before validating webhook signatures, allowing unauthenticated attackers to force resource-intensive parsing operations. Remote attackers can send malicious webhook requests to trigger denial of service by exhausting server resources through forced JSON parsing before signature rejection.

PUBLISHED Reserved 2026-04-04 | Published 2026-04-09 | Updated 2026-04-10 | Assigner VulnCheck




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-696: Incorrect Behavior Order

Product status

Default status
unaffected

Any version before 2026.3.25
affected

2026.3.25 (semver)
unaffected

Credits

tdjackey reporter

References

github.com/...enclaw/security/advisories/GHSA-3h52-cx59-c456 (GitHub Security Advisory (GHSA-3h52-cx59-c456)) third-party-advisory

github.com/...ommit/5e8cb22176e9235e224be0bc530699261eb60e53 (Patch Commit) patch

www.vulncheck.com/...unauthenticated-webhook-request-parsing (VulnCheck Advisory: OpenClaw < 2026.3.25 - Denial of Service via Unauthenticated Webhook Request Parsing) third-party-advisory

cve.org (CVE-2026-35640)

nvd.nist.gov (CVE-2026-35640)

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