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Fencer Vulns
medium 6.1

CVE-2026-91786 json

Gnome-shell: gnome-shell: out-of-bounds read in remote search icon rendering due to unvalidated icon-data buffer size

published 2026-09-15 55 d ago modified 2026-11-06 3 d ago also EUVD-2026-78417

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

A flaw was found in GNOME Shell. When processing icons from a remote search provider via D-Bus, the system fails to validate the icon's declared dimensions against the actual data buffer size. A malicious or compromised remote search provider could exploit this by providing oversized icon dimensions, leading to an out-of-bounds read. This can cause the GNOME Shell process to crash, disrupting the user's session, and potentially disclose sensitive information from adjacent memory.

Patch / fix

  • gnome-shell Debian 14 50.5-1

debian advisories DEBIAN-CVE-2026-91786

  • gnome-shell Ubuntu 22.04 LTS 42.9-0ubuntu2.4
  • gnome-shell Ubuntu 24.04 LTS 46.0-0ubuntu6~24.04.17
  • gnome-shell Ubuntu 26.04 LTS 50.1-0ubuntu1.5

ubuntu advisories UBUNTU-CVE-2026-91786

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gnome-shell SLES for SAP applications 16.0, SLES 16.0 48.4-160000.2.1
  • gnome-shell SLE Workstation Extension 15 SP7, SLE Module for Desktop Applications 15 SP7 45.3-150700.11.6.1
  • gnome-shell SLES LTSS Extended Security 12 SP5 3.20.4-77.31.2

suse advisories SUSE-SU-2026:23950-1SUSE-SU-2026:4373-1SUSE-SU-2026:4350-1

  • gnome-shell openSUSE Leap 16.0 48.4-160000.2.1

opensuse advisories openSUSE-SU-2026:21976-1

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-2026-91786 updated cvss 6.1

gnome-shell: gnome-shell: out-of-bounds read in remote search icon rendering due to unvalidated icon-data buffer size

  • Red Hat Enterprise Linux 7 gnome-shell, gnome-shell-browser-plugin Red Hat Enterprise Linux 8 gnome-shell Red Hat Enterprise Linux 9 gnome-shell Red Hat Enterprise Linux 10 gnome-shell
    affected: workaround, no fix available “Fix deferred”

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
partial
Assessed
55 d ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

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.