CVE-2026-34003

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-04-23. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial of Service (DoS). In certain configurations, higher impact outcomes may be possible.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
16.2%
KEV
Not listed

Published

April 23, 2026

Last Modified

June 30, 2026

Advisory Details (7)

Auto-updated Apr 29, 2026
Patch available. Sources: redhat.
redhat Patch Available

2451113 – (CVE-2026-34003) CVE-2026-34003 xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access

Affected: Red Hat Enterprise Linux 9

https://bugzilla.redhat.com/show_bug.cgi?id=2451113
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-34003
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:11692
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:11388
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:11369
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:11352
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:10739

Vendor Advisories for CVE-2026-34003(20)

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

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhattigervnc-0:1.12.0-6.el8_6.172026-06-08redhat
redhattigervnc-0:1.1.0-25.el6_10.162026-06-04redhat
redhattigervnc-0:1.12.0-15.el8_8.172026-06-04redhat
redhattigervnc-0:1.11.0-8.el8_4.152026-06-04redhat
redhattigervnc-0:1.14.1-10.el9_62026-06-02redhat
redhattigervnc-0:1.8.0-36.el7_9.42026-06-02redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-13.el8_82026-05-28redhat
redhatxorg-x11-server-0:1.20.10-4.el8_42026-05-28redhat
redhattigervnc-0:1.11.0-22.el9_0.172026-05-28redhat
redhatxorg-x11-server-0:1.20.11-18.el8_82026-05-28redhat
redhatxorg-x11-server-0:1.20.11-7.el8_62026-05-28redhat
redhatxorg-x11-server-0:1.20.11-13.el9_02026-05-28redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-2.el8_6.62026-05-28redhat
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
redhatxorg-x11-server-0:1.20.11-20.el9_22026-05-26redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-5.el9_02026-05-26redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-10.el9_22026-05-26redhat
redhatxorg-x11-server-Xwayland-0:22.1.9-8.el9_42026-05-26redhat
redhattigervnc-0:1.12.0-14.el9_2.142026-05-26redhat
redhatxorg-x11-server-0:1.20.11-33.el9_62026-05-26redhat
redhatxorg-x11-server-Xwayland-0:23.2.7-6.el9_62026-05-26redhat
redhatxorg-x11-server-0:1.20.11-28.el9_42026-05-26redhat
redhattigervnc-0:1.13.1-8.el9_4.92026-05-26redhat
redhatxorg-x11-server-Xwayland-0:24.1.9-4.el10_22026-05-19redhat
redhatxorg-x11-server-0:1.20.11-34.el9_82026-05-19redhat
redhatxorg-x11-server-Xwayland-0:24.1.9-4.el9_82026-05-19redhat
redhattigervnc-0:1.15.0-7.el9_8.12026-05-19redhat
redhattigervnc-0:1.15.0-9.el8_102026-05-04redhat
redhatxorg-x11-server-0:1.20.11-28.el8_102026-04-29redhat

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

(16)

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 / 68× 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 131 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-34003?
CVE-2026-34003 is a high vulnerability published on April 23, 2026. A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash,…
When was CVE-2026-34003 disclosed?
CVE-2026-34003 was first published in the National Vulnerability Database on April 23, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34003 actively exploited?
CVE-2026-34003 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34003?
CVE-2026-34003 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-34003?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34003, 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

Explore the affected products and dependency analysis for CVE-2026-34003

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