Skip to content
VulniPulse
Sign in
Advisory severityHigh7.3Red Hat Linux

High [CVE-2025-49176] Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extension

This high-severity Red Hat Linux advisory covers CVE-2025-49176 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION, Red Hat Enterprise Linux 7.7 Advanced Update Support.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2025-49176 Source published Source updated

VulniPulse record published

CVE-2025-49176
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

Summary

A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.

This computation can cause an integer overflow when a sufficiently large length value is provided, resulting in a wrapped-around total length that appears valid to the size check logic, leading to out-of-bounds memory access, successful exploitation can cause denial of service by crashing the server and may permit memory corruption, compromising system integrity and availability.

Red Hat severity: Important — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H). Weakness: CWE-190.

Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION; Red Hat Enterprise Linux 7.7 Advanced Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; and 15 more.

Affected products named by the advisory: Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 11 more.

Is CVE-2025-49176 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2025-49176 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2025-49176?

Upgrade to a fixed release named by Red Hat:

  • xorg-x11-server-Xwayland-0:24.1.5-4.el10_0
  • tigervnc-0:1.1.0-25.el6_10.1
  • tigervnc-0:1.8.0-17.el7_7.1
  • xorg-x11-server-0:1.20.4-32.el7_9
  • tigervnc-0:1.8.0-36.el7_9.2
  • xorg-x11-server-0:1.20.11-26.el8_10
  • xorg-x11-server-Xwayland-0:21.1.3-18.el8_10
  • tigervnc-0:1.15.0-7.el8_10
  • tigervnc-0:1.9.0-15.el8_2.14
  • xorg-x11-server-0:1.20.6-4.el8_2
  • xorg-x11-server-0:1.20.10-2.el8_4
  • tigervnc-0:1.11.0-8.el8_4.13

38 more fixed releases are listed below.

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Fixed versions
  • xorg-x11-server-Xwayland-0:24.1.5-4.el10_0
  • tigervnc-0:1.1.0-25.el6_10.1
  • tigervnc-0:1.8.0-17.el7_7.1
  • xorg-x11-server-0:1.20.4-32.el7_9
  • tigervnc-0:1.8.0-36.el7_9.2
  • xorg-x11-server-0:1.20.11-26.el8_10
  • xorg-x11-server-Xwayland-0:21.1.3-18.el8_10
  • tigervnc-0:1.15.0-7.el8_10
  • tigervnc-0:1.9.0-15.el8_2.14
  • xorg-x11-server-0:1.20.6-4.el8_2
  • xorg-x11-server-0:1.20.10-2.el8_4
  • tigervnc-0:1.11.0-8.el8_4.13
  • tigervnc-0:1.12.0-6.el8_6.14
  • xorg-x11-server-Xwayland-0:21.1.3-2.el8_6.4
  • xorg-x11-server-0:1.20.11-5.el8_6.3
  • xorg-x11-server-0:1.20.11-16.el8_8
  • xorg-x11-server-Xwayland-0:21.1.3-11.el8_8
  • tigervnc-0:1.12.0-15.el8_8.14
  • xorg-x11-server-0:1.20.11-31.el9_6
  • xorg-x11-server-Xwayland-0:23.2.7-4.el9_6
  • tigervnc-0:1.14.1-8.el9_6
  • xorg-x11-server-Xwayland-0:21.1.3-3.el9_0
  • xorg-x11-server-0:1.20.11-11.el9_0
  • tigervnc-0:1.11.0-22.el9_0.15
  • xorg-x11-server-Xwayland-0:21.1.3-8.el9_2
  • xorg-x11-server-0:1.20.11-18.el9_2
  • tigervnc-0:1.12.0-14.el9_2.12
  • xorg-x11-server-Xwayland-0:22.1.9-6.el9_4
  • xorg-x11-server-0:1.20.11-26.el9_4
  • tigervnc-0:1.13.1-8.el9_4.7
  • RHSA-2025:9304
  • RHSA-2025:10377
  • RHSA-2025:10376
  • RHSA-2025:10360
  • RHSA-2025:10375
  • RHSA-2025:9305
  • RHSA-2025:9392
  • RHSA-2025:10378
  • RHSA-2025:9964
  • RHSA-2025:10342
  • RHSA-2025:10349
  • RHSA-2025:10344
  • RHSA-2025:10346
  • RHSA-2025:10356
  • RHSA-2025:10343
  • RHSA-2025:10370
  • RHSA-2025:10355
  • RHSA-2025:9303
  • RHSA-2025:9306
  • RHSA-2025:10348

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Get an email when Red Hat RHEL & SELinux publishes the next one.

See Red Hat RHEL & SELinux's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).

Alert me about Red Hat RHEL & SELinux

More Red Hat Linux advisories

All Red Hat Linux advisories

iPhone and Android apps · New on the App Store

Monitor future Red Hat Linux CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Download on the App StoreGet CVE alerts on AndroidSee app features

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.

Sign in to join the discussion.