CVE-2026-84856
rowboatlabs rowboat Composio Webhook Endpoint route.ts req.json denial of service
Description
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.
INFO
Published Date :
Sept. 2, 2026, 8:17 p.m.
Last Modified :
Sept. 28, 2026, 11:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Upgrade Rowboat to version 0.9.2.
- Apply updates to the Composio Webhook Endpoint component.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-84856.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-84856 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-84856
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-84856 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-84856 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Sep. 28, 2026
Action Type Old Value New Value Added Translation Title: rowboat de rowboatlabs, Description: Una vulnerabilidad fue detectada en rowboatlabs rowboat hasta 0.9.1. El elemento afectado es la función request.text/req.json del archivo apps/rowboat/app/api/composio/webhook/route.ts del componente Composio Webhook Endpoint. La manipulación resulta en denegación de servicio. Es posible lanzar el ataque remotamente. El exploit ahora es público y puede ser utilizado. La actualización a la versión 0.9.2 es suficiente para resolver este problema. La actualización del componente afectado es recomendada. La aplicación Next.js heredada fue eliminada en 0.9.2 en lugar de parcheada, sin dejar ningún control de seguridad. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 03, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-84856', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-03T13:31:43.906524Z'} -
New CVE Received by [email protected]
Sep. 02, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added CVSS V2 (AV:N/AC:L/Au:N/C:N/I:N/A:P) Added CWE CWE-404 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/84xxx/CVE-2026-84856.json">CVE-2026-84856</a> Added Reference https://github.com/hackerguopeng/cve/tree/main/Rowboat_PreAuth_Body_Buffer_DoS_Report Added Reference https://github.com/rowboatlabs/rowboat/releases/tag/v0.9.2 Added Reference https://vuldb.com/cve/CVE-2026-84856 Added Reference https://vuldb.com/submit/886260 Added Reference https://vuldb.com/vuln/398131 Added Reference https://vuldb.com/vuln/398131/cti