# CVE-2025-49179: Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x record extension

Status: published. Published: 2025-06-17. Updated: 2026-11-04.

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.

## Remediation

- workaround: 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. (source: CNA: redhat)

## Affected products and versions

- X.Org / xwayland (xwayland): ≥ 0; < 24.1.7 (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (xorg-x11-server-Xwayland): ≥ 0:24.1.5-4.el10_0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 Extended Lifecycle Support  - EXTENSION (tigervnc): ≥ 0:1.1.0-25.el6_10.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7.7 Advanced Update Support (tigervnc): ≥ 0:1.8.0-17.el7_7.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support (xorg-x11-server): ≥ 0:1.20.4-32.el7_9; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support (tigervnc): ≥ 0:1.8.0-36.el7_9.2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (xorg-x11-server): ≥ 0:1.20.11-26.el8_10; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (xorg-x11-server-Xwayland): ≥ 0:21.1.3-18.el8_10; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (tigervnc): ≥ 0:1.15.0-7.el8_10; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.2 Advanced Update Support (tigervnc): ≥ 0:1.9.0-15.el8_2.14; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.2 Advanced Update Support (xorg-x11-server): ≥ 0:1.20.6-4.el8_2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (xorg-x11-server): ≥ 0:1.20.10-2.el8_4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (tigervnc): ≥ 0:1.11.0-8.el8_4.13; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (xorg-x11-server): ≥ 0:1.20.10-2.el8_4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (tigervnc): ≥ 0:1.11.0-8.el8_4.13; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (tigervnc): ≥ 0:1.12.0-6.el8_6.14; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (xorg-x11-server-Xwayland): ≥ 0:21.1.3-2.el8_6.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (xorg-x11-server): ≥ 0:1.20.11-5.el8_6.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (tigervnc): ≥ 0:1.12.0-6.el8_6.14; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (xorg-x11-server-Xwayland): ≥ 0:21.1.3-2.el8_6.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Service (tigervnc): ≥ 0:1.12.0-6.el8_6.14; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Service (xorg-x11-server-Xwayland): ≥ 0:21.1.3-2.el8_6.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Service (xorg-x11-server): ≥ 0:1.20.11-5.el8_6.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions (tigervnc): ≥ 0:1.12.0-6.el8_6.14; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions (xorg-x11-server-Xwayland): ≥ 0:21.1.3-2.el8_6.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions (xorg-x11-server): ≥ 0:1.20.11-5.el8_6.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On (xorg-x11-server): ≥ 0:1.20.11-16.el8_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On (xorg-x11-server-Xwayland): ≥ 0:21.1.3-11.el8_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (xorg-x11-server): ≥ 0:1.20.11-16.el8_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (tigervnc): ≥ 0:1.12.0-15.el8_8.14; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (xorg-x11-server-Xwayland): ≥ 0:21.1.3-11.el8_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (xorg-x11-server): ≥ 0:1.20.11-16.el8_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (tigervnc): ≥ 0:1.12.0-15.el8_8.14; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (xorg-x11-server-Xwayland): ≥ 0:21.1.3-11.el8_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (xorg-x11-server): ≥ 0:1.20.11-31.el9_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (xorg-x11-server-Xwayland): ≥ 0:23.2.7-4.el9_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (tigervnc): ≥ 0:1.14.1-8.el9_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (xorg-x11-server-Xwayland): ≥ 0:21.1.3-3.el9_0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (xorg-x11-server): ≥ 0:1.20.11-11.el9_0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (tigervnc): ≥ 0:1.11.0-22.el9_0.15; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (xorg-x11-server-Xwayland): ≥ 0:21.1.3-8.el9_2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (xorg-x11-server): ≥ 0:1.20.11-18.el9_2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (tigervnc): ≥ 0:1.12.0-14.el9_2.12; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (xorg-x11-server-Xwayland): ≥ 0:22.1.9-6.el9_4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (xorg-x11-server): ≥ 0:1.20.11-26.el9_4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (tigervnc): ≥ 0:1.13.1-8.el9_4.7; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (xorg-x11-server): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.3 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H; source: CNA: redhat

- CVSS 3.1: 7.3 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-04; percentile 27.59%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-190

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2025:10258 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10342 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10343 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10344 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10346 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10347 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10348 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10349 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10350 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10351 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10352 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10355 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10356 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10360 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10370 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10374 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10375 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10376 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10377 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10378 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10381 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:10410 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:9303 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:9304 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:9305 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:9306 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:9392 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:9964 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-49179 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2369978 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.freedesktop.org/xorg/xserver/-/commit/2bde9ca49a8fd9a1e6697d5e7ef837870d66f5d4 (CNA: redhat)

- https://www.x.org/wiki/Development/Security/ (CNA: redhat)

- https://lists.debian.org/debian-lts-announce/2025/06/msg00028.html (ADP: CVE)

- https://access.redhat.com/errata/RHSA-2025:10258 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10342 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10343 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10344 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10346 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10347 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10348 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10349 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10350 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10351 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10352 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10355 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10356 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10360 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10370 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10374 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10375 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10376 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10377 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10378 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10381 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:10410 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:9303 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:9304 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:9305 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:9306 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:9392 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:9964 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2025-49179 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2369978 (secalert@redhat.com)

- https://gitlab.freedesktop.org/xorg/xserver/-/commit/2bde9ca49a8fd9a1e6697d5e7ef837870d66f5d4 (secalert@redhat.com)

- https://www.x.org/wiki/Development/Security/ (secalert@redhat.com)

- https://lists.debian.org/debian-lts-announce/2025/06/msg00028.html (af854a3a-2127-422b-91ae-364da2661108)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-49179; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-49179; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-49179; retrieved 2026-11-04; source updated Not reported

Revision: db32fb8802fc92ccfa94d0d07ce1315a06ae6310ea2658c0d0c6013bcd1c4c6b

Canonical: https://y2.dev/cve/CVE-2025-49179

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