---
id: CVE-2026-86350
title: "Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a\_regression in fix for CVE-2026-41293 can trigger request header mix-up.\n\n\n\nThis issue affects Apache Tomcat: fr…"
summary: "Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a\_regression in fix for CVE-2026-41293 can trigger request header mix-up.\n\n\n\nThis issue affects Apache Tomcat: fr…"
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-444
vendor: Apache Software Foundation
product: Apache Tomcat
affected:
  - apache_tomcat >= 11.0.22 <= 11.0.25
  - apache_tomcat >= 10.1.55 <= 10.1.59
  - apache_tomcat >= 9.0.118 <= 9.0.121
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:58:26.570'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86350'
references:
  - url: 'https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc'
    label: security@apache.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86350.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-86350'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2539370'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-86350'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86350'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68257'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68258'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-23T16:16:46.410403Z'
ingestedAt: '2026-09-23T12:24:04.187Z'
epss: 0.00483
epssPercentile: 0.4146
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/abraxas/CVE-2026-86350'
  checkedAt: '2026-10-27T19:18:53.038Z'
exploitAvailable: true
patched:
  - hardened_images
scores:
  nvd: 9.1
  vendor: 7.2
---

## Overview

Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a regression in fix for CVE-2026-41293 can trigger request header mix-up.



This issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from 10.1.55 through 10.1.59, from 9.0.118 through 9.0.121.



Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

## Remediation

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

## Vendor advisories

- **RHSA-2026:68257** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68257)
- **RHSA-2026:68258** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68258)
- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat JBoss Web Server 5, Red Hat JBoss Web Server 6, Red Hat JBoss Web Server 7 · no fix planned: Red Hat JBoss Web Server 5, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-01 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86350.json)