What’s Vulnerable › Vulnerabilities

CVE-2023-43787: Libx11: integer overflow in xcreateimage() leading to a heap overflow

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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-122

Description

A vulnerability was found in libX11 due to an integer overflow within the XCreateImage() function. This flaw allows a local user to trigger an integer overflow and execute arbitrary code with elevated privileges.

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-2023-43787
• https://bugzilla.redhat.com/show_bug.cgi?id=2242254
• http://www.openwall.com/lists/oss-security/2024/01/24/9
• https://access.redhat.com/errata/RHSA-2024:2145
• https://access.redhat.com/errata/RHSA-2024:2973
• https://access.redhat.com/security/cve/CVE-2023-43787
• https://bugzilla.redhat.com/show_bug.cgi?id=2242254
• https://jfrog.com/blog/xorg-libx11-vulns-cve-2023-43786-cve-2023-43787-part-two/
• https://lists.debian.org/debian-lts-announce/2023/10/msg00005.html
• https://security.netapp.com/advisory/ntap-20231103-0006/

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