TI-2026-58340 Aliases CVE-2026-84856 GHSA-66mr-2w7f-r56j

rowboatlabs rowboat Composio Webhook Endpoint route.ts req.json denial of service

HIGH 70CWE-404Published 2026-09-02 · Updated 2026-09-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-404.

Summary

A vulnerability was detected in rowboatlabs rowboat up to 0.9.1. The impacted element is the function request.text/req.json of the file apps/rowboat/app/api/composio/webhook/route.ts of the component Composio Webhook Endpoint. The manipulation results in denial of service. It is possible to launch the attack remotely. The exploit is now public and may be used. Upgrading to version 0.9.2 is sufficient to resolve this issue. Upgrading the affected component is recommended. The legacy Next.js app was deleted at 0.9.2 rather than patched, leaving no security control behind.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00701 53rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix Fixed rowboat (rowboatlabs): 0.9.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
rowboatlabs	rowboat	0.9.0; 0.9.1	0.9.2	Patch available	CNA

rowboat Vendorrowboatlabs Affected 0.9.0; 0.9.1 Fixed in 0.9.2 Patch available CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:rowboatlabs:rowboat::::::::	—	—	rowboatlabs

cpe:2.3:a:rowboatlabs:rowboat:*:*:*:*:*:*:*:* Versions — — ·rowboatlabs

Remediation

Fix · CNA rowboat (rowboatlabs) Fixed in 0.9.2

Timeline

2026-10-02 Threatist record created from CVE-2026-84856
2026-10-03 Alias added: GHSA-66mr-2w7f-r56j

References

Exploit 1

https://github.com/hackerguopeng/cve/tree/main/Rowboat_PreAuth_Body_Buffer_DoS_Report

Patch 1

https://github.com/rowboatlabs/rowboat/releases/tag/v0.9.2

TI-2026-05822 rowboatlabs rowboat tools_webhook app.py tool_call improper authentication CVSS 4.0MEDIUM 6.9
TI-2025-06477 rowboatlabs rowboat Session route.ts PUT missing authentication CVSS 4.0MEDIUM 6.9
TI-2026-58921 Rowboat through 0.9.1 Server-Side Request Forgery via Custom MCP Server CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences