Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x record extension

Summary

CVE	CVE-2025-49179
State	PUBLISHED
Assigner	redhat
Source Priority	CVE Program / NVD first with legacy fallback
Published	2025-06-17 15:15:46 UTC
Updated	2026-06-30 11:16:20 UTC
Description	A flaw was found in the X Record extension. The RecordSanityCheckRegisterClients function does not check for an integer overflow when computing request length, which allows a client to bypass length checks.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

EPSS: 0.002790000 probability, percentile 0.196960000 (date 2026-07-03)

Problem Types: CWE-190 | CWE-190 Integer Overflow or Wraparound

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Secondary	7.3	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H`
3.1	CNA	CVSS	7.3	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H`

CVSS v3.1 Breakdown

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	X.Org	Xwayland	affected 24.1.7 semver	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 10	unaffected 0:24.1.5-4.el10_0 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION	unaffected 0:1.1.0-25.el6_10.1 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 7.7 Advanced Update Support	unaffected 0:1.8.0-17.el7_7.1 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	unaffected 0:1.20.4-32.el7_9 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	unaffected 0:1.8.0-36.el7_9.2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8	unaffected 0:1.20.11-26.el8_10 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8	unaffected 0:21.1.3-18.el8_10 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8	unaffected 0:1.15.0-7.el8_10 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.2 Advanced Update Support	unaffected 0:1.9.0-15.el8_2.14 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.2 Advanced Update Support	unaffected 0:1.20.6-4.el8_2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	unaffected 0:1.20.10-2.el8_4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	unaffected 0:1.11.0-8.el8_4.13 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	unaffected 0:1.20.10-2.el8_4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	unaffected 0:1.11.0-8.el8_4.13 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	unaffected 0:1.12.0-6.el8_6.14 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	unaffected 0:21.1.3-2.el8_6.4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	unaffected 0:1.20.11-5.el8_6.3 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	unaffected 0:1.12.0-6.el8_6.14 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	unaffected 0:21.1.3-2.el8_6.4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Telecommunications Update Service	unaffected 0:1.12.0-6.el8_6.14 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Telecommunications Update Service	unaffected 0:21.1.3-2.el8_6.4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Telecommunications Update Service	unaffected 0:1.20.11-5.el8_6.3 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions	unaffected 0:1.12.0-6.el8_6.14 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions	unaffected 0:21.1.3-2.el8_6.4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions	unaffected 0:1.20.11-5.el8_6.3 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On	unaffected 0:1.20.11-16.el8_8 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On	unaffected 0:21.1.3-11.el8_8 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	unaffected 0:1.20.11-16.el8_8 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	unaffected 0:1.12.0-15.el8_8.14 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	unaffected 0:21.1.3-11.el8_8 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions	unaffected 0:1.20.11-16.el8_8 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions	unaffected 0:1.12.0-15.el8_8.14 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions	unaffected 0:21.1.3-11.el8_8 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9	unaffected 0:1.20.11-31.el9_6 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9	unaffected 0:23.2.7-4.el9_6 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9	unaffected 0:1.14.1-8.el9_6 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions	unaffected 0:21.1.3-3.el9_0 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions	unaffected 0:1.20.11-11.el9_0 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions	unaffected 0:1.11.0-22.el9_0.15 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions	unaffected 0:21.1.3-8.el9_2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions	unaffected 0:1.20.11-18.el9_2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions	unaffected 0:1.12.0-14.el9_2.12 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	unaffected 0:22.1.9-6.el9_4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	unaffected 0:1.20.11-26.el9_4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	unaffected 0:1.13.1-8.el9_4.7 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 6	Not specified	Not specified

References

Reference	Source	Link	Tags
access.redhat.com/errata/RHSA-2025:10375	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:9304	[email protected]	access.redhat.com
www.x.org/wiki/Development/Security	[email protected]	www.x.org
access.redhat.com/errata/RHSA-2025:10374	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10356	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10381	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10378	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:9392	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:9964	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10360	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10342	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10377	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10355	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10376	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10343	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:9306	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10410	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10349	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10352	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10370	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10348	[email protected]	access.redhat.com
access.redhat.com/security/cve/CVE-2025-49179	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10344	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:9305	[email protected]	access.redhat.com
gitlab.freedesktop.org/xorg/xserver/-/commit/2bde9ca49a8fd9a1e6697d5e7ef837870d66f5d4	[email protected]	gitlab.freedesktop.org
access.redhat.com/errata/RHSA-2025:10347	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10350	[email protected]	access.redhat.com
bugzilla.redhat.com/show_bug.cgi	[email protected]	bugzilla.redhat.com
lists.debian.org/debian-lts-announce/2025/06/msg00028.html	af854a3a-2127-422b-91ae-364da2661108	lists.debian.org
access.redhat.com/errata/RHSA-2025:9303	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10258	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10351	[email protected]	access.redhat.com
access.redhat.com/errata/RHSA-2025:10346	[email protected]	access.redhat.com
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Source	Time	Event
CNA	2025-06-03T10:11:40.389Z	Reported to Red Hat.
CNA	2025-06-17T00:00:00.000Z	Made public.

Workarounds

CNA: 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.

There are currently no legacy QID mappings associated with this CVE.