CVE-2026-93866 Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write
Critical 9.2
Published
Updated
Check this codebase for CVE-2026-93866 and fix it if it is affected.
What it is: CVE-2026-93866 is a critical vulnerability in WatchGuard Fireware OS, published on 27 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-93866 in the wild and no public exploit code.
Affected product: WatchGuard Fireware OS. 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-2026-93866/ (Markdown: https://insights.sbomify.com/CVE-2026-93866/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-93866?
CVE-2026-93866 is a critical vulnerability in WatchGuard Fireware OS, published on 27 Oct 2026.
Official description
An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.
Which versions are affected by CVE-2026-93866?
How do I fix CVE-2026-93866?
No fix has been published for CVE-2026-93866 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-93866 being exploited?
There is no known exploitation of CVE-2026-93866 in the wild and no public exploit code.
Sources
Also known as GHSA-g944-9gh9-2wqp.