ALAS2-2026-3273

Amazon Linux 2 Security Advisory: ALAS2-2026-3273
Advisory Released Date: 2026-04-30
Advisory Updated Date: 2026-04-30
Severity: Important
Issue Overview:

XKB Integer Underflow in XkbSetCompatMap() (CVE-2026-33999)

XSYNC Use-after-free in miSyncTriggerFence() (CVE-2026-34001)

XKB Out-of-bounds read in CheckModifierMap() (CVE-2026-34002)

XKB Buffer overflow in CheckKeyTypes() (CVE-2026-34003)


Affected Packages:

tigervnc


Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.


Issue Correction:
Run yum update tigervnc or yum update --advisory ALAS2-2026-3273 to update your system.

New Packages:
aarch64:
    tigervnc-1.8.0-24.amzn2.0.9.aarch64
    tigervnc-server-1.8.0-24.amzn2.0.9.aarch64
    tigervnc-server-minimal-1.8.0-24.amzn2.0.9.aarch64
    tigervnc-server-module-1.8.0-24.amzn2.0.9.aarch64
    tigervnc-debuginfo-1.8.0-24.amzn2.0.9.aarch64

i686:
    tigervnc-1.8.0-24.amzn2.0.9.i686
    tigervnc-server-1.8.0-24.amzn2.0.9.i686
    tigervnc-server-minimal-1.8.0-24.amzn2.0.9.i686
    tigervnc-server-module-1.8.0-24.amzn2.0.9.i686
    tigervnc-debuginfo-1.8.0-24.amzn2.0.9.i686

noarch:
    tigervnc-server-applet-1.8.0-24.amzn2.0.9.noarch
    tigervnc-license-1.8.0-24.amzn2.0.9.noarch
    tigervnc-icons-1.8.0-24.amzn2.0.9.noarch

src:
    tigervnc-1.8.0-24.amzn2.0.9.src

x86_64:
    tigervnc-1.8.0-24.amzn2.0.9.x86_64
    tigervnc-server-1.8.0-24.amzn2.0.9.x86_64
    tigervnc-server-minimal-1.8.0-24.amzn2.0.9.x86_64
    tigervnc-server-module-1.8.0-24.amzn2.0.9.x86_64
    tigervnc-debuginfo-1.8.0-24.amzn2.0.9.x86_64

Additional References

Release Notes:  Amazon Linux 2 Release Notes

Red Hat: CVE-2026-33999, CVE-2026-34001, CVE-2026-34002, CVE-2026-34003

Mitre: CVE-2026-33999, CVE-2026-34001, CVE-2026-34002, CVE-2026-34003