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SRC: CVELISTV5 / SYNC: T-16M / LAG: 1H / REC: 386,837 / REV: C6-1C / V4

01 RecordSTATE: PUBLISHED

CVE-2026-33999

Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling

HighPUBLISHEDCNA: redhat

CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

02 Description

CNA: redhat

Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling

03 Exploitation and scoring

SRC: CISA, FIRST, NVD, RED HAT

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 31.1% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-07-15.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

SCHEMA: 5.2

Published

2026-04-23 14:53Z4 MO AGO

Last updated

2026-07-15 01:04Z1 MO AGO

Reserved

2026-03-25

Assigning CNA

redhat

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

CWE-191Integer Underflow (Wrap or Wraparound)Base

Data version

5.2

Document digest

08f2150889d2422e20161f517adb53ca1717791b6e2b2b40d8970055c2f7e1d1

05 Affected products

PAIRS: 19

VendorProductVersionsPlatforms

Red HatRed Hat Enterprise Linux 10Not specified—

Red HatRed Hat Enterprise Linux 10.0 Extended Update SupportNot specified—

Red HatRed Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONNot specified—

Red HatRed Hat Enterprise Linux 7 Extended Lifecycle SupportNot specified—

Red HatRed Hat Enterprise Linux 8Not specified—

Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportNot specified—

Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnNot specified—

Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportNot specified—

Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnNot specified—

Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update ServiceNot specified—

Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP SolutionsNot specified—

Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update ServiceNot specified—

Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP SolutionsNot specified—

Red HatRed Hat Enterprise Linux 9Not specified—

Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP SolutionsNot specified—

Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP SolutionsNot specified—

Red HatRed Hat Enterprise Linux 9.4 Extended Update SupportNot specified—

Red HatRed Hat Enterprise Linux 9.6 Extended Update SupportNot specified—

Red HatRed Hat Enterprise Linux 6Not specified—

06 References

REFS: 38

access.redhat.comRHSA-2026:10739https://access.redhat.com/errata/RHSA-2026:10739vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:11352https://access.redhat.com/errata/RHSA-2026:11352vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:11369https://access.redhat.com/errata/RHSA-2026:11369vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:11388https://access.redhat.com/errata/RHSA-2026:11388vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:11656https://access.redhat.com/errata/RHSA-2026:11656vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:11692https://access.redhat.com/errata/RHSA-2026:11692vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:13414https://access.redhat.com/errata/RHSA-2026:13414vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:19125https://access.redhat.com/errata/RHSA-2026:19125vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:19342https://access.redhat.com/errata/RHSA-2026:19342vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:19343https://access.redhat.com/errata/RHSA-2026:19343vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:19344https://access.redhat.com/errata/RHSA-2026:19344vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20547https://access.redhat.com/errata/RHSA-2026:20547vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20555https://access.redhat.com/errata/RHSA-2026:20555vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20557https://access.redhat.com/errata/RHSA-2026:20557vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20558https://access.redhat.com/errata/RHSA-2026:20558vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20560https://access.redhat.com/errata/RHSA-2026:20560vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20561https://access.redhat.com/errata/RHSA-2026:20561vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20562https://access.redhat.com/errata/RHSA-2026:20562vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20563https://access.redhat.com/errata/RHSA-2026:20563vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20575https://access.redhat.com/errata/RHSA-2026:20575vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20576https://access.redhat.com/errata/RHSA-2026:20576vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20590https://access.redhat.com/errata/RHSA-2026:20590vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:21699https://access.redhat.com/errata/RHSA-2026:21699vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:21712https://access.redhat.com/errata/RHSA-2026:21712vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:21715https://access.redhat.com/errata/RHSA-2026:21715vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:21716https://access.redhat.com/errata/RHSA-2026:21716vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:21718https://access.redhat.com/errata/RHSA-2026:21718vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:21741https://access.redhat.com/errata/RHSA-2026:21741vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:21742https://access.redhat.com/errata/RHSA-2026:21742vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:22424https://access.redhat.com/errata/RHSA-2026:22424vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:22456https://access.redhat.com/errata/RHSA-2026:22456vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:23254https://access.redhat.com/errata/RHSA-2026:23254vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:23255https://access.redhat.com/errata/RHSA-2026:23255vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:23496https://access.redhat.com/errata/RHSA-2026:23496vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:24341https://access.redhat.com/errata/RHSA-2026:24341vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-33999vdb-entryx_refsource_REDHAT
bugzilla.redhat.comRHBZ#2451106https://bugzilla.redhat.com/show_bug.cgi?id=2451106issue-trackingx_refsource_REDHAT
security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33999.jsonx_sadp-csaf-vex