CVE-2026-50263

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-05. a secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

June 5, 2026

Last Modified

August 5, 2026

Advisory Details (5)

Auto-updated Jun 16, 2026
Patch available. Sources: redhat.
generic

Jira

https://redhat.atlassian.net/browse/PSIRTSUPT-16950
generic

X.Org Security Advisory: multiple security issues X.Org X server and Xwayland

https://lists.x.org/archives/xorg-announce/2026-June/003702.html
generic

saver: re-fetch screen private after CheckScreenPrivate in CreateSaverWindow (ecc634f1) · Commits · xorg / xserver · GitLab

https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05
redhat

2485388 – (CVE-2026-50263) CVE-2026-50263 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()

https://bugzilla.redhat.com/show_bug.cgi?id=2485388
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-50263

Vendor Advisories for CVE-2026-50263(20)

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

Patch Availability(28)

Vendor / EcosystemFixed in / PatchReleasedSource
redhattigervnc-0:1.1.0-25.el6_10.182026-08-03redhat
redhattigervnc-0:1.12.0-15.el8_8.182026-07-27redhat
redhattigervnc-0:1.13.1-8.el9_4.102026-07-27redhat
redhattigervnc-0:1.11.0-8.el8_4.162026-07-27redhat
redhattigervnc-0:1.12.0-14.el9_2.152026-07-27redhat
redhattigervnc-0:1.14.1-11.el9_62026-07-27redhat
redhattigervnc-0:1.8.0-36.el7_9.52026-07-27redhat
redhattigervnc-0:1.12.0-6.el8_6.182026-07-27redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-2.el8_6.72026-07-13redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-13.el8_8.12026-07-13redhat
redhatxorg-x11-server-Xwayland-0:22.1.9-8.el9_4.12026-07-08redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-10.el9_2.12026-07-08redhat
redhatxorg-x11-server-Xwayland-0:24.1.5-6.el10_0.12026-07-08redhat
redhatxorg-x11-server-0:1.20.11-8.el8_62026-07-08redhat
redhatxorg-x11-server-Xwayland-0:23.2.7-6.el9_6.12026-07-08redhat
redhatxorg-x11-server-0:1.20.11-19.el8_82026-07-08redhat
redhatxorg-x11-server-0:1.20.10-5.el8_42026-07-08redhat
redhatxorg-x11-server-0:1.20.11-21.el9_22026-07-07redhat
redhatxorg-x11-server-0:1.20.11-29.el9_42026-07-07redhat
redhatxorg-x11-server-0:1.20.11-34.el9_62026-07-07redhat
redhatxorg-x11-server-0:1.20.4-35.el7_92026-07-07redhat
redhattigervnc-0:1.15.0-7.el9_8.22026-06-25redhat
redhattigervnc-0:1.15.0-10.el8_102026-06-24redhat
redhatxorg-x11-server-Xwayland-0:24.1.9-4.el10_2.22026-06-22redhat
redhatxorg-x11-server-0:1.20.11-34.el9_8.22026-06-17redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-20.el8_10.22026-06-17redhat
redhatxorg-x11-server-0:1.20.11-28.el8_10.22026-06-17redhat
redhatxorg-x11-server-Xwayland-0:24.1.9-4.el9_8.22026-06-17redhat

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 (13 versions)2:21.1.7-3+deb12u13—
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+deb13u1, 2:21.1.16-1.3+deb13u22:21.1.16-1.3+deb13u3—
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 ... 2:21.1.22-1 (6 versions)2:21.1.23-1—
xwayland2:24.1.10-1, 2:24.1.11-1, 2:24.1.6-1, 2:24.1.8-1, 2:24.1.9-12:24.1.12-1—
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

(7)

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 6× in last 7d / 40× 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 261 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-50263?
CVE-2026-50263 is a medium vulnerability published on June 5, 2026. A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.
When was CVE-2026-50263 disclosed?
CVE-2026-50263 was first published in the National Vulnerability Database on June 5, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50263 actively exploited?
CVE-2026-50263 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 96.2% of all scored CVEs.
What is the CVSS score of CVE-2026-50263?
CVE-2026-50263 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-50263?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50263, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-50263

Explore →

Is Your Infrastructure Affected by CVE-2026-50263?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs