---
id: CVE-2026-73095
title: >-
  Apache Juneau: Denial of service via unbounded memory allocation in parsers
  and REST request handling
summary: >-
  Allocation of Resources Without Limits or Throttling vulnerability in Apache
  Juneau.


  The MessagePack parser, which the REST server enables by default, sizes
  buffers from length values in the input. An unauthenticated client can send a
  f…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-770
vendor: Apache Software Foundation
product: 'org.apache.juneau:juneau-marshall'
affected:
  - 'org.apache.juneau:juneau-marshall < 9.2.1'
  - 'org.apache.juneau:juneau-rest-server < 9.2.1'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-05T16:57:57.354499Z'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T19:04:28.914Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-73095'
references:
  - url: 'https://lists.apache.org/thread.html/j05q7vw08j48o96tdlzcsd4sozx1lyl6'
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.501Z'
---

## Overview

Allocation of Resources Without Limits or Throttling vulnerability in Apache Juneau.

The MessagePack parser, which the REST server enables by default, sizes buffers from length values in the input. An unauthenticated client can send a few bytes that force a multi-gigabyte allocation and an OutOfMemoryError, causing denial of service. Related unbounded allocations in REST request handling (multipart uploads and request reader buffers) are fixed at the same time.

This issue affects Apache Juneau: through 9.2.0.

Users are recommended to upgrade to version 9.2.1, which fixes the issue.

## Affected

- `org.apache.juneau:juneau-marshall < 9.2.1`
- `org.apache.juneau:juneau-rest-server < 9.2.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.