CVE-2026-56000

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM 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(medium)
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(7)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatxorg-x11-server-Xwayland-0:22.1.9-8.el9_4.32026-08-10redhat
redhatxorg-x11-server-Xwayland-0:23.2.7-6.el9_6.32026-08-05redhat
redhatxorg-x11-server-Xwayland-0:24.1.5-6.el10_0.22026-08-04redhat
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.

Affected Packages

(7 across 4 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
xorg-server2:21.1.10-1 ... 2:21.1.9-1+hurd.1 (40 versions)——
xwayland2:22.1.9-1 ... 2:24.1.9-1 (23 versions)——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
xorg-server2:21.1.16-1.3 ... 2:21.1.23-1 (10 versions)——
xwayland2:24.1.10-1 ... 2:24.1.9-1 (6 versions)——
Debian:14(2)
PackageVulnerable rangeFixed inDependents
xorg-server2:21.1.16-1.3 ... 2:21.1.23-1 (7 versions)——
xwayland2:24.1.10-1 ... 2:24.1.9-1 (6 versions)——
Debian:11(1)
PackageVulnerable rangeFixed inDependents
xorg-server2:1.20.11-1 ... 2:21.1.9-1+hurd.1 (61 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 152× 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.

Showing the most recent 100 of 241 total refreshes for this CVE.

  1. 2026-08-30 07:39 UTCEG score recompute
  2. 2026-08-30 07:39 UTCVendor advisory
  3. 2026-08-30 07:39 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:41 UTCEPSS rescore
  6. 2026-08-27 21:53 UTCEG score recompute
  7. 2026-08-27 21:53 UTCVendor advisory
  8. 2026-08-27 21:53 UTCGHSA enrichment
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 01:47 UTCEG score recompute
  11. 2026-08-27 01:47 UTCVendor advisory
  12. 2026-08-27 01:47 UTCGHSA enrichment
  13. 2026-08-26 14:46 UTCEPSS rescore
  14. 2026-08-26 08:32 UTCEG score recompute
  15. 2026-08-26 08:32 UTCVendor advisory
  16. 2026-08-26 08:31 UTCGHSA enrichment
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 11:51 UTCVendor advisory
  19. 2026-08-25 11:51 UTCGHSA enrichment
  20. 2026-08-24 22:25 UTCEG score recompute
  21. 2026-08-24 22:25 UTCVendor advisory
  22. 2026-08-24 22:25 UTCGHSA enrichment
  23. 2026-08-24 09:45 UTCEG score recompute
  24. 2026-08-24 09:45 UTCVendor advisory
  25. 2026-08-24 09:45 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 19:45 UTCVendor advisory
  2. 2026-08-23 19:45 UTCGHSA enrichment
  3. 2026-08-23 07:05 UTCEG score recompute
  4. 2026-08-23 07:05 UTCVendor advisory
  5. 2026-08-23 07:05 UTCGHSA enrichment
  6. 2026-08-23 00:19 UTCEPSS rescore
  7. 2026-08-22 18:23 UTCVendor advisory
  8. 2026-08-22 18:23 UTCGHSA enrichment
  9. 2026-08-22 05:41 UTCEG score recompute
  10. 2026-08-22 05:41 UTCVendor advisory
  11. 2026-08-22 05:41 UTCGHSA enrichment
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-21 17:00 UTCVendor advisory
  14. 2026-08-21 17:00 UTCGHSA enrichment
  15. 2026-08-21 04:19 UTCEG score recompute
  16. 2026-08-21 04:19 UTCVendor advisory
  17. 2026-08-21 04:19 UTCGHSA enrichment
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-20 15:38 UTCVendor advisory
  20. 2026-08-20 15:38 UTCGHSA enrichment
  21. 2026-08-20 02:06 UTCEG score recompute
  22. 2026-08-20 02:06 UTCVendor advisory
  23. 2026-08-20 02:06 UTCGHSA enrichment
  24. 2026-08-19 17:04 UTCEPSS rescore
  25. 2026-08-19 09:33 UTCVendor advisory
  26. 2026-08-19 09:32 UTCGHSA enrichment
  27. 2026-08-18 20:47 UTCVendor advisory
  28. 2026-08-18 20:46 UTCGHSA enrichment
  29. 2026-08-17 23:31 UTCEG score recompute
  30. 2026-08-17 23:31 UTCVendor advisory
  31. 2026-08-17 23:31 UTCGHSA enrichment
  32. 2026-08-17 13:47 UTCEPSS rescore
  33. 2026-08-17 10:45 UTCVendor advisory
  34. 2026-08-17 10:45 UTCGHSA enrichment
  35. 2026-08-16 22:05 UTCEG score recompute
  36. 2026-08-16 22:05 UTCVendor advisory
  37. 2026-08-16 22:05 UTCGHSA enrichment
  38. 2026-08-16 14:56 UTCEPSS rescore
  39. 2026-08-16 09:24 UTCEG score recompute
  40. 2026-08-16 09:24 UTCVendor advisory
  41. 2026-08-16 09:24 UTCGHSA enrichment
  42. 2026-08-16 02:14 UTCEPSS rescore
  43. 2026-08-15 20:44 UTCVendor advisory
  44. 2026-08-15 20:44 UTCGHSA enrichment
  45. 2026-08-15 08:03 UTCEG score recompute
  46. 2026-08-15 08:03 UTCVendor advisory
  47. 2026-08-15 08:03 UTCGHSA enrichment
  48. 2026-08-15 01:30 UTCEPSS rescore
  49. 2026-08-14 19:22 UTCVendor advisory
  50. 2026-08-14 19:22 UTCGHSA enrichment
  51. 2026-08-14 06:42 UTCEG score recompute
  52. 2026-08-14 06:42 UTCVendor advisory
  53. 2026-08-14 06:42 UTCGHSA enrichment
  54. 2026-08-13 22:00 UTCEPSS rescore
  55. 2026-08-13 18:01 UTCVendor advisory
  56. 2026-08-13 18:01 UTCGHSA enrichment
  57. 2026-08-13 04:53 UTCVendor advisory
  58. 2026-08-13 04:53 UTCGHSA enrichment
  59. 2026-08-12 16:13 UTCEG score recompute
  60. 2026-08-12 16:13 UTCVendor advisory
  61. 2026-08-12 16:12 UTCGHSA enrichment
  62. 2026-08-12 13:51 UTCEPSS rescore
  63. 2026-08-12 03:32 UTCVendor advisory
  64. 2026-08-12 03:32 UTCGHSA enrichment
  65. 2026-08-11 14:51 UTCEG score recompute
  66. 2026-08-11 14:51 UTCVendor advisory
  67. 2026-08-11 14:51 UTCGHSA enrichment
  68. 2026-08-11 02:11 UTCEG score recompute
  69. 2026-08-11 02:11 UTCVendor advisory
  70. 2026-08-11 02:11 UTCGHSA enrichment
  71. 2026-08-11 00:00 UTCEPSS rescore
  72. 2026-08-10 13:31 UTCVendor advisory
  73. 2026-08-10 13:31 UTCGHSA enrichment
  74. 2026-08-10 00:49 UTCEG score recompute
  75. 2026-08-10 00:49 UTCVendor advisory

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 87.4% 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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