Skip to content
Fencer Vulns
high 8.9

CVE-2026-88807 json

libXrender RenderQueryPictFormats Reply Heap-based Buffer Overflow

published 2026-09-21 48 d ago modified 2026-09-22 47 d ago also EUVD-2026-83916

cvss
8.9
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

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.

Patch / fix

  • X.org libXrender 0.9.13
  • libxrender Debian 14 1:0.9.13-1

debian advisories DEBIAN-CVE-2026-88807

  • libXrender SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 0.9.10-150000.3.3.1
  • libXrender SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 0.9.11-160000.3.1
  • libXrender SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.9.8-8.3.1

suse advisories SUSE-SU-2026:4397-1SUSE-SU-2026:4395-1SUSE-SU-2026:23886-1SUSE-SU-2026:23900-1

  • libXrender openSUSE Leap 16.0 0.9.11-160000.3.1
  • libXrender openSUSE Tumbleweed 0.9.12-2.1

opensuse advisories openSUSE-SU-2026:21909-1openSUSE-SU-2026:11834-1

  • libXrender AlmaLinux 10 0.9.11-8.el10_2.1
  • libXrender AlmaLinux 9 0.9.10-16.el9_8.2
  • libXrender AlmaLinux 8 0.9.10-8.el8_10

almalinux advisories ALSA-2026:91003ALSA-2026:91057ALSA-2026:91267

  • libXrender Rocky Linux 9 0.9.10-16.el9_8.2
  • libXrender Rocky Linux 10 0.9.11-8.el10_2.1
  • libXrender Rocky Linux 8 0.9.10-8.el8_10

rocky linux advisories RLSA-2026:91057RLSA-2026:91003RLSA-2026:91267

  • libxrender Alpine 3.24 0.9.13-r0

alpine advisories ALPINE-CVE-2026-88807

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libXrender Azure Linux 3.0 0.9.13-1

azure linux advisories AZL-103391

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-88807 updated cvss 8.3

libXrender: libXrender: Code injection via heap overflow in RenderQueryPictFormats

  • Red Hat Enterprise Linux 6 libXrender
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libXrender
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) libXrender 0.9.10-8.el8_10
    fixed: vendor fix RHSA-2026:91267
  • Red Hat Enterprise Linux AppStream (v. 9) libXrender 0.9.10-16.el9_8.2
    fixed: vendor fix RHSA-2026:91057
  • Red Hat Enterprise Linux AppStream (v. 10) libXrender 0.9.11-8.el10_2.1
    fixed: vendor fix RHSA-2026:91003
  • Red Hat Hardened Images libXrender
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
49 d ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.9 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
CNA 4.0 8.9 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • X.org libXrender

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.