CVE-2023-43786

MEDIUMNVD 5.55.5—

5.5

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.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 24.4%
KEV: Not listed

Published

October 10, 2023

Last Modified

November 4, 2025

References (12)

secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2145
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2973
secalert@redhathttps://access.redhat.com/security/cve/CVE-2023-43786
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2242253
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/01/24/9
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:2145
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:2973
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/CVE-2023-43786
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2242253
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/10/msg00005.html
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/63IBRFLQVZSMOAZBZOBKFWJP26ILRAGQ/
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20231103-0006/

Patch Availability(6)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	libx11-xcb1 (2:1.6.4-3ubuntu0.4+esm2) @ bionic	2026-05-24	ubuntu
ubuntu	xpmutils (1:3.5.12-1ubuntu0.18.04.2+esm1) @ bionic	2026-05-24	ubuntu
ubuntu	libx11-xcb1 (2:1.8.4-2ubuntu0.3) @ lunar	2026-05-24	ubuntu
ubuntu	xpmutils (1:3.5.12-1.1ubuntu0.1) @ lunar	2026-05-24	ubuntu
redhat	libX11-0:1.6.8-8.el8	2024-05-22	redhat
redhat	libX11-0:1.7.0-9.el9	2024-04-30	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(7)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 16:14 UTCEG score recompute
2026-05-24 16:14 UTCVendor advisory
2026-05-24 16:14 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2023-43786?

CVE-2023-43786 is a medium vulnerability published on October 10, 2023. 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.

When was CVE-2023-43786 disclosed?

CVE-2023-43786 was first published in the National Vulnerability Database on October 10, 2023, with the most recent update on November 4, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-43786 actively exploited?

CVE-2023-43786 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-43786?

CVE-2023-43786 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2023-43786?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-43786, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-43786

Explore →

Is Your Infrastructure Affected by CVE-2023-43786?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2023-43786

Published

Last Modified

References (12)

Patch Availability(6)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-43786?

Same vendor

Same CWE

CVE-2023-43786

📅 Published

🔄 Last Modified

🔗 References (12)

Patch Availability(6)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-43786?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (12)

Frequently asked(5)

Related CVEs(same vendor + same CWE)