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CVE-2023-43786

MediumPublished

Libx11: stack exhaustion from infinite recursion in putsubimage()

Published: Oct 10, 2023
Updated: Nov 6, 2025
Assigning CNA: redhat
Evidence observed: Aug 25, 2026

Primary CVSS

5.5/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 39.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

A vulnerability was found in libX11 due to an infinite loop within the PutSubImage() function. This flaw allows a local user to consume all available system resources and cause a denial of service condition.

Sources

jfrog-CVE-2023-43786-libX11_DoSPoC
Proof-of-concept for CVE-2023-43786, a libX11 integer overflow causing infinite loop DoS. Demonstrates triggering the vulnerability via sxpm with a crafted XPM file.

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