What’s Vulnerable › Vulnerabilities

CVE-2023-43785: Libx11: out-of-bounds memory access in _xkbreadkeysyms()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-10 · updated 2026-06-17
• Weakness: CWE-787

Description

A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function. This flaw allows a local user to trigger an out-of-bounds read error and read the contents of memory on the system.

Affected products

• Fedoraproject Fedora: 38
• Red Hat Enterprise Linux: 8.0, 9.0
• x.org libX11: before 1.8.7 — fixed in 1.8.7

How to fix

Upgrade to a fixed version: x.org libX11 1.8.7. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2024:2145
• https://access.redhat.com/errata/RHSA-2024:2973
• https://access.redhat.com/security/cve/CVE-2023-43785
• https://bugzilla.redhat.com/show_bug.cgi?id=2242252
• https://access.redhat.com/errata/RHSA-2024:2145
• https://access.redhat.com/errata/RHSA-2024:2973
• https://access.redhat.com/security/cve/CVE-2023-43785
• https://bugzilla.redhat.com/show_bug.cgi?id=2242252
• https://lists.debian.org/debian-lts-announce/2023/10/msg00004.html
• https://security.netapp.com/advisory/ntap-20231103-0006/

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