CVE-2026-56000

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 88% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.0
EG Score
9.0(medium)
EPSS
11.7%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 8, 2026

Advisory Details (2)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

oss-security - FW: X.Org Security Advisory: multiple security issues X.Org X server and Xwayland

https://www.openwall.com/lists/oss-security/2026/07/08/2
generic

glx: free old context tag before allocating new one in CommonMakeCurrent (2779affb) · Commits · xorg / xserver · GitLab

https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043

Vendor Advisories for CVE-2026-56000(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 10× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-08 19:23 UTCEG score recompute
  2. 2026-07-08 19:23 UTCGHSA enrichment
  3. 2026-07-08 15:41 UTCEG score recompute
  4. 2026-07-08 15:41 UTCGHSA enrichment
  5. 2026-07-08 15:16 UTCEPSS rescore
  6. 2026-07-08 15:16 UTCEPSS rescore
  7. 2026-07-08 12:00 UTCEG score recompute
  8. 2026-07-08 12:00 UTCGHSA enrichment
  9. 2026-07-08 08:17 UTCEG score recompute
  10. 2026-07-08 08:16 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56000?
CVE-2026-56000 is a critical vulnerability published on July 8, 2026. 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.
When was CVE-2026-56000 disclosed?
CVE-2026-56000 was first published in the National Vulnerability Database on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56000 actively exploited?
CVE-2026-56000 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56000?
CVE-2026-56000 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-56000?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56000, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-56000

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