CVE-2026-84856

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-02. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 3, 2026

Advisory Details (2)

Auto-updated Sep 2, 2026
Patch available. Sources: github_release.
github_release Patch Available

v0.9.2

Patch available: rowboatlabs/rowboat v0.9.2 (pre-release)

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

cve/Rowboat_PreAuth_Body_Buffer_DoS_Report at main · hackerguopeng/cve · GitHub

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

Vendor Advisories for CVE-2026-84856(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 19× in last 7d / 52× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 19:20 UTCEG score recompute
  2. 2026-09-19 19:20 UTCGHSA enrichment
  3. 2026-09-18 19:51 UTCEG score recompute
  4. 2026-09-18 19:51 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-17 20:37 UTCEG score recompute
  7. 2026-09-17 20:37 UTCGHSA enrichment
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-16 18:36 UTCEG score recompute
  10. 2026-09-16 18:36 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 18:54 UTCEG score recompute
  14. 2026-09-15 18:54 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-14 19:40 UTCGHSA enrichment
  18. 2026-09-13 20:26 UTCEG score recompute
  19. 2026-09-13 20:26 UTCGHSA enrichment
  20. 2026-09-12 21:12 UTCEG score recompute
  21. 2026-09-12 21:12 UTCGHSA enrichment
  22. 2026-09-11 21:58 UTCEG score recompute
  23. 2026-09-11 21:58 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 27 more
  1. 2026-09-10 22:44 UTCEG score recompute
  2. 2026-09-10 22:44 UTCGHSA enrichment
  3. 2026-09-09 23:30 UTCGHSA enrichment
  4. 2026-09-08 23:11 UTCEG score recompute
  5. 2026-09-08 23:11 UTCGHSA enrichment
  6. 2026-09-08 22:01 UTCEPSS rescore
  7. 2026-09-07 14:51 UTCGHSA enrichment
  8. 2026-09-06 15:25 UTCEG score recompute
  9. 2026-09-06 15:25 UTCGHSA enrichment
  10. 2026-09-06 13:48 UTCEPSS rescore
  11. 2026-09-05 16:10 UTCEG score recompute
  12. 2026-09-05 16:10 UTCGHSA enrichment
  13. 2026-09-05 15:31 UTCEPSS rescore
  14. 2026-09-04 16:55 UTCEG score recompute
  15. 2026-09-04 16:55 UTCGHSA enrichment
  16. 2026-09-04 05:07 UTCEPSS rescore
  17. 2026-09-03 17:39 UTCGHSA enrichment
  18. 2026-09-03 15:31 UTCEG score recompute
  19. 2026-09-03 15:31 UTCGHSA enrichment
  20. 2026-09-03 15:30 UTCNVD updateCVSS v4 → 5.5
  21. 2026-09-03 14:35 UTCEG score recompute
  22. 2026-09-03 14:35 UTCGHSA enrichment
  23. 2026-09-03 14:33 UTCMITRE cvelistV5CVSS v4 → 6.9
  24. 2026-09-02 20:21 UTCEG score recompute
  25. 2026-09-02 20:19 UTCNVD updateCVSS v4 → 5.5
  26. 2026-09-02 19:51 UTCEG score recompute
  27. 2026-09-02 19:50 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-84856?
CVE-2026-84856 is a medium vulnerability published on September 2, 2026. 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…
When was CVE-2026-84856 disclosed?
CVE-2026-84856 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84856 actively exploited?
CVE-2026-84856 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.4% of all scored CVEs.
What is the CVSS score of CVE-2026-84856?
CVE-2026-84856 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-84856?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84856, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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