VDB

CVE-2026-33999

CVE-2026-33999 PUBLISHED CVSS 7.800000190734863 HIGH

A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.

EPSS 0.00% · 0.2th percentile

Risk Scores

CVSS v3.1
7.800000190734863
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score
0.00%
0.2th percentile

Affected Products

VendorProductVersions
Red HatRed Hat Enterprise Linux 7
Red HatRed Hat Enterprise Linux 10
Red HatRed Hat Enterprise Linux 9
Red HatRed Hat Enterprise Linux 8
Red HatRed Hat Enterprise Linux 6
Red HatRed Hat Enterprise Linux 8
Red HatRed Hat Enterprise Linux 9
Red HatRed Hat Enterprise Linux 7
Red HatRed Hat Enterprise Linux 9
Red HatRed Hat Enterprise Linux 6
Red HatRed Hat Enterprise Linux 8

Timeline

  • Apr 14, 2026 CVE Published
  • Apr 15, 2026 PoC Published
  • Apr 15, 2026 PoC Published
  • Apr 19, 2026 PoC Published
  • Apr 22, 2026 PoC Published
  • Apr 23, 2026 PoC Published
  • Apr 24, 2026 Security Advisory
  • Apr 27, 2026 Distribution Patch
  • Apr 27, 2026 Security Advisory
  • Apr 28, 2026 Distribution Patch
  • Apr 28, 2026 Security Advisory
  • Apr 28, 2026 Distribution Patch
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