---
title: "CVE-2026-101356: Apache Tomcat - Broken Access Control"
description: "Apache Tomcat 11.0.22-11.0.26, 10.1.55-10.1.60, 9.0.118-9.0.122 contains a broken access control caused by incorrect object recycling and re-use in HTTP/2 asynchronous servlet processing, letting attackers cause request/response mix-up between users, exploit requires HTTP/2 asynchronous servlet usage."
url: https://panop.io/threat-heartbeat/CVE-2026-101356/
---

# CVE-2026-101356 Apache Tomcat - Broken Access Control

Apache Tomcat 11.0.22-11.0.26, 10.1.55-10.1.60, 9.0.118-9.0.122 contains a broken access control caused by incorrect object recycling and re-use in HTTP/2 asynchronous servlet processing, letting attackers cause request/response mix-up between users, exploit requires HTTP/2 asynchronous servlet usage.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-101356)

## Details

Type

Broken Access Control

Impact

Broken Access Control, Information Disclosure

CVSS vector

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

Published

20 October 2026

Updated

21 October 2026

Weakness

[CWE-362](https://cwe.mitre.org/data/definitions/362.html)

## Vendor fix

Upgrade to versions 11.0.27, 10.1.61, or 9.0.123.

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-2026-101356](https://nvd.nist.gov/vuln/detail/CVE-2026-101356)
- [https://lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27](https://lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27)
- [http://www.openwall.com/lists/oss-security/2026/10/20/27](http://www.openwall.com/lists/oss-security/2026/10/20/27)

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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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