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
Trending — 4 sources updated this week
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
40%
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 (23 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 (6 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 10× in last 7d / 154× 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 288 total refreshes for this CVE.

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

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 60.1% 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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