# CVE-2026-91786: Gnome-shell: gnome-shell: out-of-bounds read in remote search icon rendering due to unvalidated icon-data buffer size

> A malicious remote search provider can trigger an out-of-bounds read in GNOME Shell, causing session crashes and potential memory disclosure.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 15 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-91786, GHSA-f22f-r8xp-wr6f, SUSE-SU-2026:23950-1, SUSE-SU-2026:4350-1, SUSE-SU-2026:4373-1, UBUNTU-CVE-2026-91786, openSUSE-SU-2026:21976-1

## What is CVE-2026-91786?

CVE-2026-91786 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 15 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-91786?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `gnome-shell` | SUSE:Linux Enterprise Module for Desktop Applications 15 SP7 | All versions | 45.3-150700.11.6.1 |
| `gnome-shell` | SUSE:Linux Enterprise Server 16.0 | All versions | 48.4-160000.2.1 |
| `gnome-shell` | SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 3.20.4-77.31.2 |
| `gnome-shell` | SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 48.4-160000.2.1 |
| `gnome-shell` | SUSE:Linux Enterprise Workstation Extension 15 SP7 | All versions | 45.3-150700.11.6.1 |
| `gnome-shell` | openSUSE:Leap 16.0 | All versions | 48.4-160000.2.1 |

## How do I fix CVE-2026-91786?

Apply the vendor's patch.

## Is CVE-2026-91786 being exploited?

There is no known exploitation of CVE-2026-91786 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-91786 and fix it if it is affected.

What it is: CVE-2026-91786 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 15 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-91786 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-91786/ (Markdown: https://insights.sbomify.com/CVE-2026-91786/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-91786
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-91786
- OSV: https://osv.dev/vulnerability/CVE-2026-91786

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-91786/
Summaries are generated and may contain mistakes; the official description above is the record.