# CVE-2026-96957: .NET cryptographic signature verification bypass

Source: https://junglewise.ai/threats/cve-2026-96957-improper-verification-of-cryptographic-signature-in-net-allows-an  
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-2026-96957 · Severity: high · CVSS 8.8 · Published 2026-10-13

.NET is a widely-used software development framework for building applications across Windows, web, and cloud platforms. This vulnerability allows attackers to bypass cryptographic signature verification over a network, potentially allowing unauthorized access or tampering with signed data and security features that depend on signatures.

Technologies: [Apple macOS](https://junglewise.ai/threats/technologies/macos-tahoe), [Linux Kernel](https://junglewise.ai/threats/technologies/kernel), [Microsoft .Net](https://junglewise.ai/threats/technologies/microsoft-net), [Microsoft Visual Studio 2022](https://junglewise.ai/threats/technologies/visual-studio-2022), [Microsoft Visual Studio 2026](https://junglewise.ai/threats/technologies/visual-studio), [Microsoft Windows](https://junglewise.ai/threats/technologies/windows-). Vendors: [Apple](https://junglewise.ai/threats/vendors/apple), [Linux](https://junglewise.ai/threats/vendors/linux), [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-96957 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-96957 being exploited in the wild.

**How severe is CVE-2026-96957?** High severity, with a CVSS score of 8.8, published 13 October 2026.

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

**Is there a fix for CVE-2026-96957?** 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-2026-96957 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-96957?** Check whether you run Apple macOS, Linux Kernel, Microsoft .Net or one of the others listed. 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

The vulnerability involves improper verification of cryptographic signatures in .NET, allowing an attacker to bypass signature validation checks over a network. This is a CWE-347 class flaw affecting the core cryptographic validation logic. An attacker with network access can exploit this without authentication to bypass security mechanisms that rely on signed data integrity.

## Affected products

- Microsoft .NET

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96957](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96957)

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