# CVE-2026-50262: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds read/write in glx changedrawableattributes

> An out-of-bounds read in the X.Org X server allows attackers to disclose sensitive information via crafted GLX requests.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Jun 2026
- **Updated:** 28 Sep 2026
- **Also known as:** AZL-89528, AZL-89574, BELL-CVE-2026-50262, CLSA-2026-1782986813, DEBIAN-CVE-2026-50262, ECHO-215b-cde4-2d00, GHSA-jx39-26rr-cwqp, UBUNTU-CVE-2026-50262

## What is CVE-2026-50262?

CVE-2026-50262 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 5 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.

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

## Which versions are affected by CVE-2026-50262?

It affects 3 products.


Products: Redhat Enterprise Linux, X.org X Server, X.org Xwayland.

## How do I fix CVE-2026-50262?

Apply the vendor's patch.

## Is CVE-2026-50262 being exploited?

There is no known exploitation of CVE-2026-50262 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2018-14667](https://insights.sbomify.com/CVE-2018-14667/): Red Hat JBoss RichFaces Framework Expression Language Injection (critical 9.8, exploited in the wild)
- [CVE-2021-20325](https://insights.sbomify.com/CVE-2021-20325/): Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit (critical 9.8)
- [CVE-2018-25011](https://insights.sbomify.com/CVE-2018-25011/): Memory corruption in libwebp (critical 9.8)
- [CVE-2018-25014](https://insights.sbomify.com/CVE-2018-25014/): Other in libwebp (critical 9.8)
- [CVE-2014-3585](https://insights.sbomify.com/CVE-2014-3585/): Supply chain in redhat-upgrade-tool (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-50262 and fix it if it is affected.

What it is: CVE-2026-50262 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 5 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-50262 in the wild and no public exploit code.

Affected product: Redhat Enterprise Linux. 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-2026-50262/ (Markdown: https://insights.sbomify.com/CVE-2026-50262/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-50262
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-50262
- OSV: https://osv.dev/vulnerability/CVE-2026-50262

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-50262/
Summaries are generated and may contain mistakes; the official description above is the record.