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HIGH

CVE-2025-49176

CVSS v3

7.3

HIGH

EPSS Score

0.4 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • tigervncAlmaLinux:9all versions · fixed in 1.14.1-8.el9_6and 6 other packages
  • tigervncAlmaLinux:8all versions · fixed in 1.15.0-7.el8_10and 6 other packages
  • xorg-x11-server-XdmxAlmaLinux:9all versions · fixed in 1.20.11-31.el9_6and 7 other packages
  • xorg-x11-server-XdmxAlmaLinux:8all versions · fixed in 1.20.11-26.el8_10and 7 other packages
  • xorg-x11-server-XwaylandAlmaLinux:10all versions · fixed in 24.1.5-4.el10_0and 1 other package
  • xorg-x11-server-XwaylandAlmaLinux:9all versions · fixed in 23.2.7-4.el9_6and 1 other package
  • xorg-x11-server-XwaylandAlmaLinux:8all versions · fixed in 21.1.3-18.el8_10

Vendor advisories

  • CVE-2025-49176 Red Hat Product Security1,166 products fixed · 9 known affected

    xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Integer Overflow in Big Requests Extension

    xorg-x11-server-Xdmx as a component of Red Hat Enterprise Linux 6 · xorg-x11-server-Xephyr as a component of Red Hat Enterprise Linux 6 · xorg-x11-server-Xnest as a component of Red Hat Enterprise Linux 6

  • RHSA-2025:10410 Red Hat Product Security40 products fixed

    Red Hat Security Advisory: tigervnc security update

  • RHSA-2025:10381 Red Hat Product Security40 products fixed

    Red Hat Security Advisory: tigervnc security update

  • RHSA-2025:10377 Red Hat Product Security15 products fixed

    Red Hat Security Advisory: tigervnc security update

  • RHSA-2025:10375 Red Hat Product Security26 products fixed

    Red Hat Security Advisory: tigervnc security update

  • RHSA-2025:10374 Red Hat Product Security40 products fixed

    Red Hat Security Advisory: tigervnc security update

23 more advisories

Full record on NVD

Description

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Published
2025-06-17
Last Modified
2026-04-15

Frequently asked questions

What is CVE-2025-49176?

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.

Is CVE-2025-49176 actively exploited?

Active exploitation of CVE-2025-49176 has not been confirmed. Its EPSS score was 0.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-49176?

CVE-2025-49176 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H.

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