---
id: CVE-2026-88807
title: "A heap overflow in libXrender before 0.9.13 in\_RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients."
summary: "A heap overflow in libXrender before 0.9.13 in\_RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients."
severity: high
cvss: 8.9
cvssVector: 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'
cwe:
  - CWE-122
vendor: X.org
product: libXrender
affected:
  - libXrender < 0.9.13
published: '2026-09-21'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:40:05.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88807'
references:
  - url: 'https://gitlab.freedesktop.org/xorg/lib/libxrender/-/merge_requests/19'
    label: meissner@suse.de
tags:
  - nvd
  - cve.org
epss: 0.0026
epssPercentile: 0.18005
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-21T00:00:00+00:00'
cvssSource: cna
ingestedAt: '2026-09-21T14:38:56.363Z'
---

## Overview

A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.