CVE-2026-56000

HIGHNVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-08. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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
7.8
EG Score
7.8(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 9, 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(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatxorg-x11-server-Xwayland-0:24.1.9-4.el9_8.32026-07-13redhat
redhatxorg-x11-server-Xwayland-0:24.1.9-4.el10_2.32026-07-13redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 24× in last 7d / 80× 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. 2026-07-29 19:05 UTCVendor advisory
  2. 2026-07-29 19:05 UTCGHSA enrichment
  3. 2026-07-29 05:59 UTCVendor advisory
  4. 2026-07-29 05:59 UTCGHSA enrichment
  5. 2026-07-28 17:16 UTCEG score recompute
  6. 2026-07-28 17:16 UTCVendor advisory
  7. 2026-07-28 17:16 UTCGHSA enrichment
  8. 2026-07-28 15:37 UTCEPSS rescore
  9. 2026-07-28 04:24 UTCVendor advisory
  10. 2026-07-28 04:24 UTCGHSA enrichment
  11. 2026-07-27 15:42 UTCEG score recompute
  12. 2026-07-27 15:42 UTCVendor advisory
  13. 2026-07-27 15:42 UTCGHSA enrichment
  14. 2026-07-27 01:11 UTCEG score recompute
  15. 2026-07-27 01:11 UTCVendor advisory
  16. 2026-07-27 01:11 UTCGHSA enrichment
  17. 2026-07-26 14:54 UTCEPSS rescore
  18. 2026-07-26 12:30 UTCEG score recompute
  19. 2026-07-26 12:30 UTCVendor advisory
  20. 2026-07-26 12:30 UTCGHSA enrichment
  21. 2026-07-25 14:18 UTCEPSS rescore
  22. 2026-07-24 14:18 UTCEPSS rescore
  23. 2026-07-23 14:18 UTCEPSS rescore
  24. 2026-07-23 03:20 UTCEG score recompute
  25. 2026-07-22 14:08 UTCEPSS rescore
Show 55 more
  1. 2026-07-21 15:25 UTCEPSS rescore
  2. 2026-07-20 17:08 UTCEPSS rescore
  3. 2026-07-19 14:31 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 02:29 UTCEPSS rescore
  6. 2026-07-18 10:04 UTCEPSS rescore
  7. 2026-07-16 18:17 UTCVendor advisory
  8. 2026-07-16 18:17 UTCGHSA enrichment
  9. 2026-07-16 17:03 UTCEPSS rescore
  10. 2026-07-16 05:33 UTCVendor advisory
  11. 2026-07-16 05:33 UTCGHSA enrichment
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-15 16:57 UTCEPSS rescore
  14. 2026-07-15 16:52 UTCVendor advisory
  15. 2026-07-15 16:52 UTCGHSA enrichment
  16. 2026-07-15 04:11 UTCVendor advisory
  17. 2026-07-15 04:11 UTCGHSA enrichment
  18. 2026-07-15 02:00 UTCEPSS rescore
  19. 2026-07-15 02:00 UTCEPSS rescore
  20. 2026-07-14 15:27 UTCVendor advisory
  21. 2026-07-14 15:27 UTCGHSA enrichment
  22. 2026-07-14 02:47 UTCVendor advisory
  23. 2026-07-14 02:47 UTCGHSA enrichment
  24. 2026-07-13 22:31 UTCEPSS rescore
  25. 2026-07-13 14:06 UTCVendor advisory
  26. 2026-07-13 14:06 UTCGHSA enrichment
  27. 2026-07-13 06:13 UTCEPSS rescore
  28. 2026-07-13 06:13 UTCEPSS rescore
  29. 2026-07-13 01:24 UTCGHSA enrichment
  30. 2026-07-12 12:43 UTCGHSA enrichment
  31. 2026-07-12 05:46 UTCEPSS rescore
  32. 2026-07-12 00:01 UTCGHSA enrichment
  33. 2026-07-11 11:21 UTCGHSA enrichment
  34. 2026-07-11 08:27 UTCEPSS rescore
  35. 2026-07-11 08:27 UTCEPSS rescore
  36. 2026-07-10 22:40 UTCGHSA enrichment
  37. 2026-07-10 10:00 UTCGHSA enrichment
  38. 2026-07-09 21:20 UTCEG score recompute▼ 1.20
  39. 2026-07-09 21:20 UTCGHSA enrichment
  40. 2026-07-09 19:48 UTCNVD updateCVSS v3 → 7.8 · severity → HIGH
  41. 2026-07-09 19:10 UTCEPSS rescore
  42. 2026-07-09 19:10 UTCEPSS rescore
  43. 2026-07-09 17:38 UTCGHSA enrichment
  44. 2026-07-09 13:54 UTCGHSA enrichment
  45. 2026-07-09 10:11 UTCGHSA enrichment
  46. 2026-07-09 06:29 UTCGHSA enrichment
  47. 2026-07-09 02:47 UTCGHSA enrichment
  48. 2026-07-08 23:06 UTCGHSA enrichment
  49. 2026-07-08 19:23 UTCGHSA enrichment
  50. 2026-07-08 15:41 UTCGHSA enrichment
  51. 2026-07-08 15:16 UTCEPSS rescore
  52. 2026-07-08 15:16 UTCEPSS rescore
  53. 2026-07-08 12:00 UTCGHSA enrichment
  54. 2026-07-08 08:17 UTCEG score recompute
  55. 2026-07-08 08:16 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-56000?
CVE-2026-56000 is a high 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, with the most recent update on July 9, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 87.1% of all scored CVEs.
What is the CVSS score of CVE-2026-56000?
CVE-2026-56000 has a CVSS v3 base score of 7.8 (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

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