---
id: CVE-2025-49178
title: A flaw was found in the X server's request handling
summary: >-
  A flaw was found in the X server's request handling. Non-zero 'bytes to
  ignore' in a client's request can cause the server to skip processing another
  client's request, potentially leading to a denial of service.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-667
published: '2025-06-17'
updated: '2026-06-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-49178'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2025:10258'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10342'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10343'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10344'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10346'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10347'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10348'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10349'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10350'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10351'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10352'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10355'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10356'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10360'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10370'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10374'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10375'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10376'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10377'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10378'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10381'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:10410'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:9303'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:9304'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:9305'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:9306'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:9392'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:9964'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2025-49178'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2369977'
    label: secalert@redhat.com
  - url: >-
      https://gitlab.freedesktop.org/xorg/xserver/-/commit/d55c54cecb5e83eaa2d56bed5cc4461f9ba318c2
    label: secalert@redhat.com
  - url: 'https://www.x.org/wiki/Development/Security/'
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2025/06/msg00028.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.0024
epssPercentile: 0.13443
ingestedAt: '2026-06-29T13:24:34.377Z'
---

## Overview

A flaw was found in the X server's request handling. Non-zero 'bytes to ignore' in a client's request can cause the server to skip processing another client's request, potentially leading to a denial of service.

## Remediation

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