CVE-2026-103593 Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution
Critical 9.1
Published
Updated
Check this codebase for CVE-2026-103593 and fix it if it is affected.
What it is: CVE-2026-103593 is a critical vulnerability in WatchGuard Fireware OS, published on 27 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-103593 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-2026-103593/ (Markdown: https://insights.sbomify.com/CVE-2026-103593/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-103593?
CVE-2026-103593 is a critical vulnerability in WatchGuard Fireware OS, published on 27 Oct 2026.
Official description
A stack-based buffer overflow vulnerability in the Fireware OS logging service allows a network-adjacent attacker who can impersonate or intercept traffic to the configured log server to execute arbitrary code with root privileges by presenting a specially crafted certificate.
Which versions are affected by CVE-2026-103593?
How do I fix CVE-2026-103593?
No fix has been published for CVE-2026-103593 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-103593 being exploited?
There is no known exploitation of CVE-2026-103593 in the wild and no public exploit code.
Sources
Also known as GHSA-5m22-q329-28xw.