CVE-2026-34000

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 60% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the CheckSetGeom() and XkbAddGeomKeyAlias functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

May 5, 2026

Last Modified

June 8, 2026

Advisory Details (12)

Auto-updated Aug 1, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:20575
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:20563
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:20562
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:20561
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:20560
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:20558
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:20557
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:20555
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:20547
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:19342
redhat

2451107 – (CVE-2026-34000) CVE-2026-34000 xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in XKB geometry processing.

https://bugzilla.redhat.com/show_bug.cgi?id=2451107
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-34000

Vendor Advisories for CVE-2026-34000(20)

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

Patch Availability(25)

Vendor / EcosystemFixed in / PatchReleasedSource
redhattigervnc-0:1.12.0-6.el8_6.172026-06-08redhat
redhattigervnc-0:1.12.0-15.el8_8.172026-06-04redhat
redhattigervnc-0:1.1.0-25.el6_10.162026-06-04redhat
redhattigervnc-0:1.11.0-8.el8_4.152026-06-04redhat
redhattigervnc-0:1.8.0-36.el7_9.42026-06-02redhat
redhattigervnc-0:1.14.1-10.el9_62026-06-02redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-13.el8_82026-05-28redhat
redhatxorg-x11-server-0:1.20.11-18.el8_82026-05-28redhat
redhatxorg-x11-server-0:1.20.11-13.el9_02026-05-28redhat
redhatxorg-x11-server-0:1.20.11-7.el8_62026-05-28redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-2.el8_6.62026-05-28redhat
redhattigervnc-0:1.11.0-22.el9_0.172026-05-28redhat
redhatxorg-x11-server-0:1.20.10-4.el8_42026-05-28redhat
redhatxorg-x11-server-0:1.20.11-33.el9_62026-05-26redhat
redhatxorg-x11-server-Xwayland-0:22.1.9-8.el9_42026-05-26redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-10.el9_22026-05-26redhat
redhattigervnc-0:1.13.1-8.el9_4.92026-05-26redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-5.el9_02026-05-26redhat
redhatxorg-x11-server-Xwayland-0:24.1.5-6.el10_02026-05-26redhat
redhatxorg-x11-server-0:1.20.4-34.el7_92026-05-26redhat
redhattigervnc-0:1.12.0-14.el9_2.142026-05-26redhat
redhatxorg-x11-server-0:1.20.11-28.el9_42026-05-26redhat
redhatxorg-x11-server-Xwayland-0:23.2.7-6.el9_62026-05-26redhat
redhatxorg-x11-server-0:1.20.11-20.el9_22026-05-26redhat
redhattigervnc-0:1.15.0-7.el9_8.12026-05-19redhat

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-server2:21.1.7-3 ... 2:21.1.7-3+deb12u9 (12 versions)2:21.1.7-3+deb12u12—
xwayland2:22.1.9-1 ... 2:24.1.9-1 (24 versions)——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
xorg-server2:21.1.16-1.3, 2:21.1.16-1.3+deb13u12:21.1.16-1.3+deb13u2—
xwayland2:24.1.10-1 ... 2:24.1.9-1 (7 versions)——
Debian:14(2)
PackageVulnerable rangeFixed inDependents
xorg-server2:21.1.16-1.3, 2:21.1.18-1, 2:21.1.18-2, 2:21.1.20-1, 2:21.1.21-12:21.1.22-1—
xwayland2:24.1.6-1, 2:24.1.8-1, 2:24.1.9-12:24.1.10-1—
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.

Additional Vendor Advisories

(5)

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 8× in last 7d / 32× 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 311 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-34000?
CVE-2026-34000 is a critical vulnerability published on May 5, 2026. A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the CheckSetGeom() and XkbAddGeomKeyAlias functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server,…
When was CVE-2026-34000 disclosed?
CVE-2026-34000 was first published in the National Vulnerability Database on May 5, 2026, with the most recent update on June 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34000 actively exploited?
CVE-2026-34000 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 58.9% of all scored CVEs.
What is the CVSS score of CVE-2026-34000?
CVE-2026-34000 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-34000?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34000, 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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