CVE-2026-86531
Received Received - Intake

OpenEJB HTTP Server Denial of Service via Unlimited Request Size

Publication date: 2026-11-10

Last updated on: 2026-11-10

Assigner: Apache Software Foundation

Description
The embedded OpenEJB HTTP server does not limit the size of incoming request bodies or of multipart requests, and does not remove the temporary files it creates for multipart parts. A remote unauthenticated attacker can cause excessive memory or disk usage, leading to denial of service. Deployments using the Tomcat connectors are not affected. Users are recommended to block network access to the embedded HTTP server from untrusted clients, or to migrate to the Tomcat based TomEE distributions.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-11-10
Last Modified
2026-11-10
Generated
2026-11-10
AI Q&A
2026-11-10
EPSS Evaluated
N/A
NVD
CVE-2026-86531
EUVD
EUVD-2026-121163

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
apache openejb *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability involves the embedded OpenEJB HTTP server not restricting the size of incoming request bodies or multipart requests. It also fails to remove temporary files created during multipart processing. This allows a remote unauthenticated attacker to consume excessive memory or disk space, causing a denial of service.

Impact Analysis

An attacker could exploit this to overload your system by sending large requests, leading to crashes or degraded performance. This may disrupt services relying on the OpenEJB HTTP server.

Mitigation Strategies

Block network access to the embedded HTTP server from untrusted clients. Migrate to Tomcat-based TomEE distributions if possible.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-86531. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart

Security Radar

News mentioning this vulnerability
Loading related security news...