---
title: "CVE-2026-115721: Apache Vysper - Denial of Service"
description: "Apache Vysper contains an unbounded allocation vulnerability in XML parsing, leading to out of memory conditions, letting attackers cause denial of service, exploit requires sending crafted XML data."
url: https://panop.io/threat-heartbeat/CVE-2026-115721/
---

# CVE-2026-115721 Apache Vysper - Denial of Service

Apache Vysper contains an unbounded allocation vulnerability in XML parsing, leading to out of memory conditions, letting attackers cause denial of service, exploit requires sending crafted XML data.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-115721)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

26 October 2026

Updated

27 October 2026

## Vendor fix

No fix available as the project is retired; users should migrate to an alternative.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-115721](https://nvd.nist.gov/vuln/detail/CVE-2026-115721)
- [http://www.openwall.com/lists/oss-security/2026/10/23/20](http://www.openwall.com/lists/oss-security/2026/10/23/20)
- [https://lists.apache.org/thread.html/d0bx15hjcs69gktk9tt25vgvk121c9vm](https://lists.apache.org/thread.html/d0bx15hjcs69gktk9tt25vgvk121c9vm)
- [https://mina.apache.org/vysper-project/](https://mina.apache.org/vysper-project/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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