CVE-2026-84856 rowboatlabs rowboat Composio Webhook Endpoint route.ts req.json denial of service
Remote attackers can cause denial of service in Rowboat via the Composio Webhook Endpoint by exploiting improper request handling.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84856?
CVE-2026-84856 is a medium-severity denial of service vulnerability in rowboatlabs rowboat, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-404
Which versions are affected by CVE-2026-84856?
How do I fix CVE-2026-84856?
No fix has been published for CVE-2026-84856 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-84856 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84856 exists.
Sources
Also known as GHSA-66mr-2w7f-r56j.