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VulnerabilityPublished Updated

CVE-2026-50263: Red Hat Enterprise Linux 10 · Use After Free

Affects Red Hat Enterprise Linux 10Source CVE Database V5

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Not known to be exploited · CVSS 5.5 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
5.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Enterprise Linux 10xorg-x11-server-XwaylandAffected–Fixed in–
Red Hat Enterprise Linux 10.0 Extended Update Supportxorg-x11-server-XwaylandAffected–Fixed in–
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONtigervncAffected–Fixed in–
Red Hat Enterprise Linux 7 Extended Lifecycle Supportxorg-x11-serverAffected–Fixed in–
Red Hat Enterprise Linux 7 Extended Lifecycle SupporttigervncAffected–Fixed in–
Red Hat Enterprise Linux 8xorg-x11-server-XwaylandAffected–Fixed in–

AI-suggested

Red Hat has released security updates for xorg-x11-server and xorg-x11-server-Xwayland that fix this vulnerability. Users of Red Hat Enterprise Linux 8 and 10 should apply the updates referenced in Red Hat Advisory RHSA-2026:26562 promptly. The vendor advisory is the authoritative source for patching instructions and confirms that a fix is available.

Description

CVE-2026-50263 is a use-after-free vulnerability in the X.Org X server and Xwayland's CreateSaverWindow() function on Red Hat Enterprise Linux 10. This flaw allows a client to trigger a use-after-free read by changing window attributes and forcing the screen saver, which can lead to information disclosure. The vulnerability has a CVSS score of 5.5, indicating medium severity. Red Hat has issued an advisory with security updates addressing this and related vulnerabilities in xorg-x11-server and xorg-x11-server-Xwayland. The fix is available as part of these updates.

References

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