Vulnerability in Rowboatlabs Rowboat
CVE-2026-84856
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.007 (52.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Rowboatlabs Rowboat — versions 0.9.0, 0.9.1
Weakness classification (CWE)
References
- github.com/hackerguopeng/cve/tree/main/Rowboat_PreAuth_Body_Buffer_DoS_Report (exploit)
- github.com/rowboatlabs/rowboat/releases/tag/v0.9.2 (patch)
- vuldb.com/cve/CVE-2026-84856 (third-party-advisory)
- vuldb.com/submit/886260 (third-party-advisory)
- vuldb.com/vuln/398131 (technical-description, vdb-entry)
- vuldb.com/vuln/398131/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-84856?
- CVE-2026-84856 is a medium-severity vulnerability in Rowboatlabs Rowboat, classified under Improper Resource Shutdown or Release. CVSS score: 5.3/10. Published 2026-09-02.
- How severe is CVE-2026-84856?
- Medium severity. CVSS v3 base score is 5.3 out of 10.