CVE-2026-93520 X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write
High 7.8
Published
Updated
Check this codebase for CVE-2026-93520 and fix it if it is affected.
What it is: CVE-2026-93520 is a high-severity vulnerability in x.org xorg-x11-server, published on 28 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-93520 in the wild and no public exploit code.
Affected product: x.org xorg-x11-server. 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-2026-93520/ (Markdown: https://insights.sbomify.com/CVE-2026-93520/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-93520?
CVE-2026-93520 is a high-severity vulnerability in x.org xorg-x11-server, published on 28 Oct 2026.
Official description
A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.
Weakness: CWE-122
Which versions are affected by CVE-2026-93520?
How do I fix CVE-2026-93520?
Upgrade to a fixed version.
Is CVE-2026-93520 being exploited?
There is no known exploitation of CVE-2026-93520 in the wild and no public exploit code.
Sources
Also known as AZL-111455, AZL-111491, BELL-CVE-2026-93520, DEBIAN-CVE-2026-93520, ECHO-200f-d15d-9fa0, GHSA-wgf4-w3hh-3mvm and 1 more.