CVE-2026-115721

HIGH 7.5

Apache Vysper: Unbounded allocation

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

**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.

Vendor	apache software foundation
Product	apache vysper
Published	Oct 26, 2026
Last Updated	Oct 26, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

Apache Software Foundation / Apache Vysper

0 ≤ *

References

NVD ↗ CVE.org ↗ EPSS Data ↗

mina.apache.org: https://mina.apache.org/vysper-project/ lists.apache.org: https://lists.apache.org/thread.html/d0bx15hjcs69gktk9tt25vgvk121c9vm openwall.com: http://www.openwall.com/lists/oss-security/2026/10/23/20

Credits

Gjoko Krstic (Zero Science Lab)