CVE-2026-115721
Deferred Deferred - Pending Action

Unbounded Memory Allocation in Apache Vysper XML Parsing

Publication date: 2026-10-26

Last updated on: 2026-10-26

Assigner: Apache Software Foundation

Description
**UNSUPPORTED WHEN ASSIGNED**  Unbounded allocation in XML parsing in Apache Vysper; all versions, may lead to an out of memory condition. This issue affects all versions of Apache Vysper. Apache Vysper is an XMPP (Jabber) server library. As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative.

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Meta Information

Published
2026-10-26
Last Modified
2026-10-26
Generated
2026-10-26
AI Q&A
2026-10-26
EPSS Evaluated
N/A
NVD
CVE-2026-115721
EUVD
EUVD-2026-109915

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Apache Software Foundation Apache Vysper 0

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability involves unbounded allocation in XML parsing in Apache Vysper, an XMPP (Jabber) server library. It may lead to an out-of-memory condition, potentially causing the application to crash or become unresponsive.

Detection Guidance

Since Apache Vysper is retired and no longer supported, detection may involve monitoring for out-of-memory errors or unusual XML parsing behavior in XMPP server logs. Check for processes consuming excessive memory or crashes during XML-heavy operations.

Impact Analysis

The vulnerability can cause system instability by consuming excessive memory, leading to crashes or denial-of-service conditions. Since Apache Vysper is no longer supported, there is no official fix available.

Mitigation Strategies

Migrate to an actively maintained XMPP server alternative as Apache Vysper is no longer supported and no fixes will be released. Disable or remove Apache Vysper from your network to prevent exploitation.

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