CVE-2025-26599

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-02-25. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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.

An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized pointer later.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
29.4%
KEV
Not listed

Published

February 25, 2025

Last Modified

June 29, 2026

Advisory Details (10)

Auto-updated Jun 25, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 7 Extended Lifecycle Support.

https://access.redhat.com/errata/RHSA-2025:2879
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2025:2875
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Extended Update Support.

https://access.redhat.com/errata/RHSA-2025:2874
redhat Patch Available

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

https://access.redhat.com/errata/RHSA-2025:2873
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.2 Advanced Update Support.

https://access.redhat.com/errata/RHSA-2025:2866
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Telecommunications Update

https://access.redhat.com/errata/RHSA-2025:2865
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.8 Extended Update Support.

https://access.redhat.com/errata/RHSA-2025:2862
redhat Patch Available

Affected: Red Hat Enterprise Linux 7 Extended Lifecycle Support.

https://access.redhat.com/errata/RHSA-2025:2861
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2025:2502
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2025:2500

Vendor Advisories for CVE-2025-26599(4)

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

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxwayland-hwe-16.04 (2:1.19.6-1ubuntu4.1~16.04.6+esm9) @ xenial2026-05-21ubuntu
ubuntuxwayland (2:24.1.2-1ubuntu0.4) @ oracular2026-05-21ubuntu
ubuntuxwayland-hwe-16.04 (2:1.19.6-1ubuntu4.1~16.04.6+esm7) @ xenial2026-05-21ubuntu
redhatxorg-x11-server-Xwayland-0:24.1.5-3.el10_02025-05-13redhat
redhatxorg-x11-server-Xwayland-0:23.2.7-3.el9_62025-05-13redhat
redhatxorg-x11-server-0:1.20.11-28.el9_62025-05-13redhat
redhattigervnc-0:1.1.0-25.el6_102025-04-17redhat
redhattigervnc-0:1.11.0-22.el9_0.132025-03-17redhat
redhattigervnc-0:1.8.0-36.el7_92025-03-17redhat
redhattigervnc-0:1.11.0-8.el8_4.122025-03-17redhat
redhattigervnc-0:1.12.0-6.el8_6.132025-03-17redhat
redhattigervnc-0:1.12.0-15.el8_8.122025-03-17redhat
redhattigervnc-0:1.9.0-15.el8_2.132025-03-17redhat
redhattigervnc-0:1.13.1-8.el9_4.52025-03-17redhat
redhatxorg-x11-server-0:1.20.4-30.el7_92025-03-17redhat
redhattigervnc-0:1.12.0-14.el9_2.102025-03-17redhat
redhattigervnc-0:1.14.1-1.el9_5.12025-03-10redhat
redhattigervnc-0:1.13.1-15.el8_102025-03-10redhat

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

(15)

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 11× in last 7d / 47× 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 127 total refreshes for this CVE.

  1. 2026-07-23 02:52 UTCEG score recompute
  2. 2026-07-22 14:07 UTCEPSS rescore
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  25. 2026-06-22 02:07 UTCOSV refresh
  26. 2026-06-21 14:56 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-26599?
CVE-2025-26599 is a high vulnerability published on February 25, 2025. An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the…
When was CVE-2025-26599 disclosed?
CVE-2025-26599 was first published in the National Vulnerability Database on February 25, 2025, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-26599 actively exploited?
CVE-2025-26599 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-26599?
CVE-2025-26599 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2025-26599?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-26599, 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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