CVE-2026-115721: Apache Vysper: Unbounded allocation

[Thomas Wolf <twolf () apache org>]

Severity: moderate 
    CVSS 3.1: 7.5 (high) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected versions:

- Apache Vysper: all versions

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.

Credit:

Gjoko Krstic (Zero Science Lab) (finder)

References:

https://mina.apache.org/vysper-project/
https://mina.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-115721