Openclaw cli: OpenClaw: LINE webhook handler lacks shared pre-auth concurrency budget before signature verification (CVE-2026-41343)
Description
The OpenClaw CLI's LINE webhook handler in versions before 2026.3.31 lacks a shared pre-authentication concurrency budget before signature verification. This flaw can cause transient availability loss but does not impact confidentiality or integrity. The vulnerability has been assigned CVE-2026-41343 with a medium severity rating and a CVSS score of 5.3. A patch is available in version 2026.3.31 and later.
CVSS v3.1
Score 5.3medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-41343 describes a vulnerability in the OpenClaw CLI's LINE webhook handler where the public webhook path does not enforce a shared pre-auth concurrency budget before signature verification. This can lead to transient availability loss due to unbounded concurrent requests prior to authentication. The issue affects versions from 2026.1.29 up to but not including 2026.3.31. The vulnerability does not affect confidentiality or integrity, only availability. The fix was introduced in version 2026.3.31.
Potential Impact
The impact is limited to transient availability loss on the public LINE webhook path. There is no impact on confidentiality or integrity of data. The vulnerability could allow an attacker to cause temporary denial of service conditions by overwhelming the webhook handler with concurrent unauthenticated requests.
Mitigation Recommendations
A patch is available and should be applied by upgrading to OpenClaw CLI version 2026.3.31 or later. This update introduces a shared pre-auth concurrency budget before signature verification, mitigating the transient availability loss. No additional mitigation steps are required beyond applying the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BREW-openclaw-cli-CVE-2026-41343
- Osv Schema Version
- 1.7.3
- Ecosystems
- ["Homebrew"]
- Cvss Version
- 3.1
Threat ID: 6ac245a412601ec6a316619c
Added to database: 10/04/2026, 12:25:08 UTC
Last enriched: 10/04/2026, 12:50:16 UTC
Last updated: 10/04/2026, 16:08:38 UTC
Views: 1
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