---
id: CVE-2026-101356
title: >-
  tomcat: tomcat: Information disclosure via incorrect object recycling in
  HTTP/2 processing (CVE-2026-101356)
summary: >-
  A flaw was found in Apache Tomcat. Incorrect object recycling and reuse during
  the HTTP/2 processing of asynchronous servlets can cause requests and
  responses to be mixed up between different users. A remote attacker could
  exploit this vul…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cvssSource: vendor
cwe: CWE-488
vendor: Red Hat
product: Red Hat Hardened Images
affected:
  - hardened_images
patched:
  - hardened_images
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T23:30:37+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101356.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101356.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-101356'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2556186'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-101356'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101356'
  - url: 'https://lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27'
  - url: 'https://access.redhat.com/errata/RHSA-2026:85926'
  - url: 'https://access.redhat.com/errata/RHSA-2026:81365'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-20T18:17:35.437643Z'
scores:
  vendor: 5.3
  adp: 9.1
ingestedAt: '2026-10-20T14:08:00.569Z'
epss: 0.00499
epssPercentile: 0.42548
---

## Overview

A flaw was found in Apache Tomcat. Incorrect object recycling and reuse during the HTTP/2 processing of asynchronous servlets can cause requests and responses to be mixed up between different users. A remote attacker could exploit this vulnerability to trigger unintended data cross-over, potentially leading to information disclosure.

## Vendor advisories

- **RHSA-2026:85926** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85926)
- **RHSA-2026:81365** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:81365)

**tomcat: tomcat: Information disclosure via incorrect object recycling in HTTP/2 processing** — rated Moderate by Red Hat. Released 2026-10-20.

Fixed:

- Red Hat Hardened Images

## Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:85926
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:81365