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CVE

CVE-2026-33999

RHSA-2026:13414: tigervnc security update (Important)
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CVE

CVE-2026-33999

RHSA-2026:13414: tigervnc security update (Important)

Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

Security Fix(es):

  • xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling (CVE-2026-33999)
  • xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001)
  • xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003)
  • TigerVNC: x0vncserver: TigerVNC x0vncserver: Information disclosure, data manipulation, and denial of service via incorrect permissions (CVE-2026-34352)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.8
-
3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
C
H
U
-
C
H
U
-

Related Resources

No items found.

References

https://access.redhat.com/errata/RHSA-2026:13414, https://access.redhat.com/security/cve/CVE-2026-33999, https://access.redhat.com/security/cve/CVE-2026-34001, https://access.redhat.com/security/cve/CVE-2026-34003, https://access.redhat.com/security/cve/CVE-2026-34352

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.0038%
EPSS Percentile
0.3003%
Introduced Version
0
Fix Available
0:1.15.0-9.el8_10,0:21.1.3-20.el8_10,0:1.20.11-28.el8_10,0:23.2.7-6.el9_7,0:1.20.11-33.el9_7,0:1.20.11-34.el9_8,0:24.1.9-4.el9_8,0:1.15.0-6.el9_7.1,0:1.15.0-7.el9_8.1,2:21.1.7-3+deb12u12,2:21.1.16-1.3+deb13u2,21.1.22-r0,24.1.10-r0,0:24.1.9-4.el9_8.2,0:1.20.11-34.el9_8.2,0:1.20.4-29.0.7.el7_9,0:1.20.4-22.amzn2.0.11,0:1.8.0-24.amzn2.0.9,0:24.1.3-1.amzn2023.0.4,0:21.1.13-5.amzn2023.0.9,0:1.14.1-3.amzn2023.0.5

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