What is CVE-2026-115721?

CVE-2026-115721 is a high-severity vulnerability in Apache Software Foundation Vysper, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-10-26.

How severe is CVE-2026-115721?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Apache Software Foundation Vysper

CVE-2026-115721

**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.

Published 2026-10-26 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Apache Software Foundation Vysper

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

Frequently asked questions

What is CVE-2026-115721?: CVE-2026-115721 is a high-severity vulnerability in Apache Software Foundation Vysper, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-10-26.
How severe is CVE-2026-115721?: High severity. CVSS v3 base score is 7.5 out of 10.