CVE-2026-34000: Red Hat Enterprise Linux 10.0 Extended Update Support · Out-of-bounds Read
Affects Red Hat Enterprise Linux 10.0 Extended Update SupportSource CVE Database V5
Not known to be exploited · CVSS 6.1 Medium.
Data as of 2 Nov 2026, 22:58 UTC
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 42% 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:LExploitation evidence
Disclosed: evidence found.
CVE published 5 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 2 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10.0 Extended Update Supportxorg-x11-server-Xwayland | Affected– | Fixed in– |
| Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONtigervnc | Affected– | Fixed in– |
| Red Hat Enterprise Linux 7 Extended Lifecycle Supportxorg-x11-server | Affected– | Fixed in– |
| Red Hat Enterprise Linux 7 Extended Lifecycle Supporttigervnc | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportxorg-x11-server | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supporttigervnc | Affected– | Fixed in– |
AI-suggested
Red Hat has released official security updates that fix this vulnerability in xorg-x11-server-Xwayland and related packages. Users should apply the updates provided in Red Hat advisories RHSA-2026:19342 and RHSA-2026:20547 as soon as possible. Detailed update instructions are available at https://access.redhat.com/articles/11258. Since this is an important security update, applying the official patches is the recommended mitigation.
Description
CVE-2026-34000 is an out-of-bounds read vulnerability in the X.Org X server's XKB geometry processing components affecting Red Hat Enterprise Linux versions 9.2 through 9.8. This flaw can allow an attacker with local or remote access to the X11 server to disclose memory contents or cause a denial of service by crashing the server. Red Hat has released security advisories and updates addressing this issue as part of important security updates for xorg-x11-server-Xwayland and related packages.
References
- access.redhat.com/errata/RHSA-2026:19342 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20547 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20555 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20557 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20558 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20560 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20561 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20562 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20563 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20575 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20576 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20590 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21699 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21712 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21715 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21716 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21718 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21741 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21742 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:22424 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:22456 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:23254 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:23255 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:23496 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:24341 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-34000 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2451107 (opens in a new tab)