Apache Storm Client: deserialization flaw

Apache Storm

Apache Storm Client deserializes untrusted data, allowing code execution. Affected versions: 3.0.0 before 3.1.0.

Do this now

Upgrade Apache Storm Client to 3.1.0.

Who should check: teams running Java

Fix it

Upgrade to Apache Storm Client 3.1.0

First seen: 9 Nov 2026
Last update: 13 Nov 2026, 07:21 UTC
Fixed in: 3.1.0
Identifiers: CVE-2026-82436
CVSS: 8.8
Source: news
On the menu as: Java

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Apache Storm Client: deserialization flaw
Severity: high. Patch status: patched.
Affected: Apache Storm
Fixed in: 3.1.0
Ids: CVE-2026-82436

Apache Storm Client deserializes untrusted data, allowing code execution. Affected versions: 3.0.0 before 3.1.0.

## Steps
1. Search the repo, its CI and infra config for Apache Storm. If present, report the version in use and whether it's affected.
2. Fix by release line: Apache Storm Client: 3.1.0.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| Apache Storm Client | fixed | 3.1.0 | — |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-82436") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://seclists.org/oss-sec/2026/q4/581
https://pwned.coffee/i/apache-storm-client-deserialization-flaw-cve-2026-82436

Timeline

10 Nov 2026, 06:18 UTC
Fix status: unknown → patched.
9 Nov 2026, 06:17 UTC
Fix status: patched → unknown.
9 Nov 2026
First reported.

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
Apache Storm Client before 3.1.0 3.1.0 CVE record (CNA) checked 13 Nov
Score: CVSS 8.8 (high). CVSS 3.1 8.8 (CISA ADP) for CVE-2026-82436
Last checked: 13 Nov 2026, 16:26 UTC

Product	Affected	Fixed in	Source
Apache Storm Client	before 3.1.0	3.1.0	CVE record (CNA) checked 13 Nov

Sources: KEV – CVE record ✓ Vendor ✓

Sources

seclists.org: CVE-2026-82436: Apache Storm Client: Deserialization of Untrusted Data from the State Store

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