CVE-2026-56000

HIGHNVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

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, GitHub Security Advisory, NVD CVSS v3
7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.8Exploit: None knownExposed services: Not assessed

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
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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 (value × EchelonGraph’s weight)
Severity78% × 45%
The EG Score, 7.8 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 8, 2026

Last Modified

July 9, 2026

Advisory Details (2)

Auto-updated Jul 8, 2026
Patch available.
Web page

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
Web page

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
xorg-server2:21.1.10-1 ... 2:21.1.9-1+hurd.1 (42 versions)
  • every version on: no fix on record
—
xwayland2:22.1.9-1 ... 2:24.1.9-1 (24 versions)
  • every version on: no fix on record
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
xorg-server2:21.1.16-1.3, 2:21.1.16-1.3+deb13u1, 2:21.1.16-1.3+deb13u2, 2:21.1.16-1.3+deb13u3
  • every version up to 2:21.1.16-1.3+deb13u4: fixed in 2:21.1.16-1.3+deb13u4
—
xwayland2:24.1.10-1 ... 2:24.1.9-1 (7 versions)
  • every version on: no fix on record
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
xorg-server2:21.1.16-1.3 ... 2:21.1.23-1 (7 versions)
  • every version up to 2:21.1.24-1: fixed in 2:21.1.24-1
—
xwayland2:24.1.10-1 ... 2:24.1.9-1 (6 versions)
  • every version up to 2:24.1.13-1: fixed in 2:24.1.13-1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
xorg-server2:1.20.11-1 ... 2:21.1.9-1+hurd.1 (61 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 45× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 317 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 217 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  18. 2026-10-01 16:21 UTCEG score recompute
  19. 2026-10-01 16:21 UTCVendor advisory
  20. 2026-10-01 16:21 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  22. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-09-28 13:32 UTCEG score recompute
  25. 2026-09-28 13:32 UTCVendor advisory
Show 75 more
  1. 2026-09-28 13:32 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  2. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  4. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  5. 2026-09-24 11:54 UTCEG score recompute
  6. 2026-09-24 11:54 UTCVendor advisory
  7. 2026-09-24 11:54 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  8. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  9. 2026-09-23 06:14 UTCEG score recompute
  10. 2026-09-23 06:14 UTCVendor advisory
  11. 2026-09-23 06:14 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  12. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  13. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  14. 2026-09-18 05:47 UTCEG score recompute
  15. 2026-09-18 05:47 UTCVendor advisory
  16. 2026-09-18 05:47 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  17. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  18. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  19. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  21. 2026-09-13 23:51 UTCEG score recompute
  22. 2026-09-13 23:51 UTCVendor advisory
  23. 2026-09-13 23:51 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  25. 2026-09-13 08:27 UTCVendor advisory
  26. 2026-09-13 08:27 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  27. 2026-09-12 16:45 UTCEG score recompute
  28. 2026-09-12 16:45 UTCVendor advisory
  29. 2026-09-12 16:45 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  30. 2026-09-12 03:39 UTCEG score recompute
  31. 2026-09-12 03:39 UTCVendor advisory
  32. 2026-09-12 03:39 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  33. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  34. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  35. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  36. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  37. 2026-09-06 14:07 UTCEG score recompute
  38. 2026-09-06 14:07 UTCVendor advisory
  39. 2026-09-06 14:07 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  40. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  41. 2026-09-05 22:51 UTCEG score recompute
  42. 2026-09-05 22:51 UTCVendor advisory
  43. 2026-09-05 22:51 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  44. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  45. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  46. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  47. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  48. 2026-08-30 20:20 UTCEG score recompute
  49. 2026-08-30 20:20 UTCVendor advisory
  50. 2026-08-30 20:20 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  52. 2026-08-30 07:39 UTCEG score recompute
  53. 2026-08-30 07:39 UTCVendor advisory
  54. 2026-08-30 07:39 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  55. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  56. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  57. 2026-08-27 21:53 UTCEG score recompute
  58. 2026-08-27 21:53 UTCVendor advisory
  59. 2026-08-27 21:53 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  60. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  61. 2026-08-27 01:47 UTCEG score recompute
  62. 2026-08-27 01:47 UTCVendor advisory
  63. 2026-08-27 01:47 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  64. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  65. 2026-08-26 08:32 UTCEG score recompute
  66. 2026-08-26 08:32 UTCVendor advisory
  67. 2026-08-26 08:31 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  68. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  69. 2026-08-25 11:51 UTCVendor advisory
  70. 2026-08-25 11:51 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  71. 2026-08-24 22:25 UTCEG score recompute
  72. 2026-08-24 22:25 UTCVendor advisory
  73. 2026-08-24 22:25 UTCGHSA enrichmentGHSA-4gcc-rqqq-58jp · GitHub severity CRITICAL · GitHub CVSS 7.8
  74. 2026-08-24 09:45 UTCEG score recompute
  75. 2026-08-24 09:45 UTCVendor advisory

Related CVEs(same product + same vendor + same CWE)

Same vendor

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redhat:RHSA-2026:38489

Frequently asked(5)

What is CVE-2026-56000?
CVE-2026-56000 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-56000 was made public on July 8, 2026: that is the date its CVE record's CNA, SUSE, gives for when the vulnerability was made public. The CVE record itself was published on July 8, 2026. EchelonGraph's copy of the record carries a last-modified date of July 9, 2026; the record at its source may have been updated since.
Is CVE-2026-56000 actively exploited?
CVE-2026-56000 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-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?
A fix for CVE-2026-56000 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56000 are linked in the Vendor Advisories panel on this page.

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