# CVE-2026-88236: Microsoft QUIC null pointer dereference DoS

Source: https://junglewise.ai/threats/cve-2026-88236-null-pointer-dereference-in-microsoft-quic-allows-an-unauthorized  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-88236 · Severity: high · CVSS 7.5 · Published 2026-11-10

Microsoft QUIC is a protocol implementation used in Windows and other Microsoft products to enable fast, secure network communications. A null pointer dereference bug allows an attacker on the network to send specially crafted packets that crash QUIC-dependent services, causing a denial of service to users who depend on those services.

Technologies: [Microsoft QUIC](https://junglewise.ai/threats/technologies/microsoft-quic). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-88236 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88236 being exploited in the wild.

**How severe is CVE-2026-88236?** High severity, with a CVSS score of 7.5, published 10 November 2026.

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

**Is there a fix for CVE-2026-88236?** 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-2026-88236 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-88236?** Check whether you run Microsoft QUIC. 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

A null pointer dereference vulnerability in Microsoft QUIC allows an unauthenticated remote attacker to trigger a crash by sending malformed QUIC protocol packets over the network. The vulnerability does not require authentication or user interaction. An exploit results in denial of service to affected services using the Microsoft QUIC library.

## Affected products

- Microsoft QUIC

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88236](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88236)

## Related threats

- [Microsoft QUIC integer underflow denial of service](https://junglewise.ai/threats/cve-2026-105512-integer-underflow-wrap-or-wraparound-in-microsoft-quic-allows-an)
- [Microsoft QUIC insecure default variable initialization](https://junglewise.ai/threats/cve-2026-103577-insecure-default-variable-initialization-in-microsoft-quic)
- [Microsoft QUIC use-after-free remote code execution](https://junglewise.ai/threats/cve-2026-100219-use-after-free-in-microsoft-quic-allows-an-unauthorized-attacker)