---
id: CVE-2026-103119
title: >-
  tomcat: Apache Tomcat: Information disclosure via buffer under-read during
  non-blocking writes (CVE-2026-103119)
summary: >-
  A flaw was found in Apache Tomcat. During large non-blocking write operations,
  a buffer under-read can cause an HTTP response body to be split between the
  current request and the subsequent request handled on the same connection. A
  remote …
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L'
cvssSource: vendor
cwe:
  - CWE-125
  - CWE-127
vendor: Red Hat
product: Red Hat Hardened Images
affected:
  - hardened_images
patched:
  - hardened_images
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T23:30:36+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103119.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103119.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-103119'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2556195'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-103119'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103119'
  - url: 'https://lists.apache.org/thread.html/sk2cg4k077fwcqbm6tqz2n700nq06h80'
  - 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: '2026-10-20T15:41:16.526893Z'
scores:
  vendor: 4.8
  adp: 9.1
ingestedAt: '2026-10-20T14:08:00.566Z'
epss: 0.00586
epssPercentile: 0.47822
---

## Overview

A flaw was found in Apache Tomcat. During large non-blocking write operations, a buffer under-read can cause an HTTP response body to be split between the current request and the subsequent request handled on the same connection. A remote user sending a follow-up request could receive sensitive data intended for the prior response, leading to information disclosure. This issue can also cause the subsequent request to fail, resulting in a denial of service (DoS).

## 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: Apache Tomcat: Information disclosure via buffer under-read during non-blocking writes** — 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