---
id: CVE-2026-88041
title: 'Apache Tomcat: HTTP/2 trailer header cross-contamination'
summary: >-
  Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer
  information from a previous request to leak into a subsequent request.




  This issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from
  10.1.27 through 10.1.6…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cvssSource: adp
cwe:
  - CWE-459
vendor: Apache Software Foundation
product: Apache Tomcat
affected:
  - apache_tomcat >= 11.0.0-M23 <= 11.0.26
  - apache_tomcat >= 10.1.27 <= 10.1.60
  - apache_tomcat >= 9.0.92 <= 9.0.122
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-29T17:54:06.134329Z'
published: '2026-10-20'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T17:54:59.322Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-88041'
references:
  - url: 'https://lists.apache.org/thread.html/dnmm9l3byytg3l66nk1jrqfrl7jty7n1'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88041.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-88041'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2556182'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-88041'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88041'
  - url: 'https://access.redhat.com/errata/RHSA-2026:85926'
  - url: 'https://access.redhat.com/errata/RHSA-2026:81365'
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00514
epssPercentile: 0.43847
patched:
  - hardened_images
ingestedAt: '2026-10-20T14:08:00.571Z'
---

## Overview

Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request.



This issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122.



Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.

## Affected

- `apache_tomcat >= 11.0.0-M23 <= 11.0.26`
- `apache_tomcat >= 10.1.27 <= 10.1.60`
- `apache_tomcat >= 9.0.92 <= 9.0.122`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## 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)