Vulnerability

CVE-2026-34000

High· 6.1ZDICVSS6.1EPSS0%

.rules3/5

ZDI-26-334: X.Org Server CheckSetGeom Out-Of-Bounds Read Information Disclosure Vulnerability

This vulnerability allows local attackers to disclose sensitive information on affected installations of X.Org Server. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 6.1. The following CVEs are assigned: CVE-2026-34000.

Threat signal

75/100

High

Severity

high

CVSS

6.1

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

6.1/ 10MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

Attack VectorLocalRequires local access — shell, console, or local app.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredLowStandard user privileges sufficient.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactNoneNo integrity impact.
Availability ImpactLowReduced performance / interruptions.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.03%

probability of exploitation in next 30 days

higher than 8% of all CVEs

3-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-34000. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2026-06-09Published
2026-06-09Last modified2 sources

References

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.