---
title: "CVE-2026-82435: Apache Storm - Denial of Service"
description: "Apache Storm contains a denial of service vulnerability caused by the Netty message decoder allocating large buffers before SASL authentication, letting unauthenticated attackers with TCP access to worker ports cause resource exhaustion, exploit requires TCP reachability to worker port."
url: https://panop.io/threat-heartbeat/CVE-2026-82435/
---

# CVE-2026-82435 Apache Storm - Denial of Service

Apache Storm contains a denial of service vulnerability caused by the Netty message decoder allocating large buffers before SASL authentication, letting unauthenticated attackers with TCP access to worker ports cause resource exhaustion, exploit requires TCP reachability to worker port.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.65% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-82435)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

14 September 2026

Updated

15 October 2026

Weakness

[CWE-789](https://cwe.mitre.org/data/definitions/789.html)

## Vendor fix

Upgrade to version 3.1.0 or later; alternatively, restrict worker port access within the cluster and enable storm.messaging.netty.authentication.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-82435](https://nvd.nist.gov/vuln/detail/CVE-2026-82435)
- [https://lists.apache.org/thread/wqfy7qb8c76f4c3wr2w6bhoz62vcnpb7](https://lists.apache.org/thread/wqfy7qb8c76f4c3wr2w6bhoz62vcnpb7)
- [http://www.openwall.com/lists/oss-security/2026/09/13/15](http://www.openwall.com/lists/oss-security/2026/09/13/15)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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