CVE-2026-108398 .NET Framework Security Feature Bypass Vulnerability
High 8.8
Published
Updated
Check this codebase for CVE-2026-108398 and fix it if it is affected.
What it is: CVE-2026-108398 is a high-severity vulnerability in Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2, published on 13 Oct 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-2026-108398 in the wild and no public exploit code.
Affected product: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2. 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-2026-108398/ (Markdown: https://insights.sbomify.com/CVE-2026-108398/index.md)
An authorized local attacker can bypass security features in .NET Framework via an untrusted search path vulnerability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-108398?
CVE-2026-108398 is a high-severity vulnerability in Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.
Weakness: CWE-426
Which versions are affected by CVE-2026-108398?
How do I fix CVE-2026-108398?
No fix has been published for CVE-2026-108398 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-108398 being exploited?
There is no known exploitation of CVE-2026-108398 in the wild and no public exploit code.
Sources
Also known as GHSA-895h-jx6m-8rp6.