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GHSA-q447-rj3r-2cgh

HighCVSS 7.5 / 10
Published Feb 18, 2026·Last modified Mar 5, 2026
Affected Components(0)

No affected components available

Description

Summary

Multiple webhook handlers accepted and buffered request bodies without a strict unified byte/time limit. A remote unauthenticated attacker could send oversized payloads and cause memory pressure, degrading availability.

Details

Affected packages:

  • openclaw (npm): <2026.2.12
  • clawdbot (npm): <=2026.1.24-3

Root cause:

  • Webhook code paths buffered request payloads without consistent maxBytes + timeoutMs enforcement.
  • Some SDK-backed handlers parse request bodies internally and needed stream-level guards.

Attack shape:

  • Send very large JSON payloads or slow/incomplete uploads to webhook endpoints.
  • Observe elevated memory usage and request handler pressure.

Impact

Remote unauthenticated availability impact (DoS) via request body amplification/memory pressure.

Patch details (implemented)

  • Added shared bounded request-body helper in src/infra/http-body.ts.
  • Exported helper in src/plugin-sdk/index.ts for extension reuse.
  • Migrated webhook body readers to shared helper for:
    • LINE
    • Nextcloud Talk
    • Google Chat
    • Zalo
    • BlueBubbles
    • Nostr profile HTTP
    • Voice-call
    • Gateway hooks
  • Added stream guards for SDK handlers that parse request bodies internally:
    • Slack
    • Telegram
    • Feishu
  • Added explicit Express JSON body limit handling for MS Teams webhook path.
  • Standardized failure responses:
    • 413 Payload Too Large
    • 408 Request Timeout

Tests

  • Added regression tests:
    • src/infra/http-body.test.ts
    • src/line/monitor.read-body.test.ts
    • extensions/nextcloud-talk/src/monitor.read-body.test.ts
  • Focused webhook/security test suite passes for patched paths.

Remediation

Upgrade to the first release containing this patch.

Credits

Thanks @vincentkoc for reporting.

Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.44%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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