# CVE-2026-108398: .NET Framework untrusted search path security feature bypass

Source: https://junglewise.ai/threats/cve-2026-108398-untrusted-search-path-in-net-framework-allows-an-authorized  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-108398 · Severity: high · CVSS 8.8 · Published 2026-10-13

.NET Framework is a core library used by Windows applications for fundamental operations. An authorized local user can bypass security protections by exploiting how the framework searches for libraries, potentially allowing execution of malicious code or unauthorized access to protected resources.

Technologies: [Microsoft .NET Framework](https://junglewise.ai/threats/technologies/net-framework). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-108398 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-108398 being exploited in the wild.

**How severe is CVE-2026-108398?** High severity, with a CVSS score of 8.8, published 13 October 2026.

**Which products and versions are affected?** Microsoft .NET Framework.

**Is there a fix for CVE-2026-108398?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-108398 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-108398?** Check whether you run Microsoft .NET Framework. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An untrusted search path vulnerability in .NET Framework permits an authenticated local attacker to bypass security features through directory hijacking or DLL preloading. The attack requires local access and existing authorization on the system. A successful exploit could allow elevation of privilege or circumvention of code integrity checks.

## Affected products

- Microsoft .NET Framework

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108398](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108398)

## Related threats

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- [Asymmetric resource consumption (amplification) in .NET allows an unauthorized attacker to deny service over a network.](https://junglewise.ai/threats/cve-2026-96960-microsoft-security-advisory-net-and-visual-studio-denial-of)
- [Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny service over a network.](https://junglewise.ai/threats/cve-2026-96959-microsoft-security-advisory-net-and-visual-studio-denial-of)
- [Microsoft .NET certificate validation bypass in Cryptography.Xml](https://junglewise.ai/threats/cve-2026-96222-microsoft-security-advisory-net-spoofing-vulnerability)
- [Heap-based buffer overflow in Visual Studio allows an unauthorized attacker to execute code over a network.](https://junglewise.ai/threats/cve-2026-69522-microsoft-diasymreader-native-heap-buffer-overflow-in-pdb)