CVE-2026-56000

CRITICAL

CVSS v4.0: 9.0 · EPSS: 0.0021 (11.7 percentile)

NetworkNo user interactionUse After FreeVendor advisory ref

Source data as of:

At a glance

Severity
CRITICAL
CVSS
9.0 v4.0 · NVD
EPSS
0.0021 (11.7 percentile) · FIRST.org
CISA KEV
No
Type
Use After Free · NVD CWE
Attack conditions (CVSS vector)
NetworkNo user interaction · Source: NVD Vector
Published
2026-07-08 · Modified: 2026-07-08
References
Jump to references (2)

CVSS / EPSS / KEV

CVSS v4.0 9.0 / 10 CRITICAL Source: NVD
EPSS 0.0021 11.7 percentile Source: FIRST.org
CISA KEV No Source: CISA

Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources

Description

Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.

Record details

CVE ID
CVE-2026-56000
CVSS (v4.0)
9.0 (CRITICAL)
Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS
0.0021 (11.7 percentile) — 2026-07-09
CISA KEV
No
Weakness (CWE)
CWE-416
Affected configurations (CPE)
0
Published
2026-07-08
Modified
2026-07-08
Status
Received

References

Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.

Related records

Other records sharing a factual facet, for cross-reference. A descriptive neighbourhood — ordering does not imply priority and is not a recommendation.

Same weakness type (CWE)

CVE-2023-30186 CRITICAL CVSS 9.8 CVE-2026-52924 CRITICAL CVSS 9.8 CVE-2026-53260 CRITICAL CVSS 9.8 CVE-2026-42985 HIGH CVSS 8.8

Published the same year

CVE-2026-32871 CRITICAL CVSS 10.0 CVE-2026-46595 CRITICAL CVSS 10.0 CVE-2026-48282 CRITICAL CVSS 10.0 KEV CVE-2026-54763 CRITICAL CVSS 10.0
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