Quick answers
- Is CVE-2026-100219 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-100219 being exploited in the wild.
- How severe is CVE-2026-100219?
- Critical severity, with a CVSS score of 9.8, published 13 October 2026.
- Which products and versions are affected?
- Microsoft QUIC.
- Is there a fix for CVE-2026-100219?
- 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-2026-100219 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-100219?
- 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 use-after-free vulnerability in Microsoft QUIC allows remote code execution over the network. The flaw enables an attacker to access memory that has been freed, leading to code execution with no authentication required. The attack is triggered by malicious network traffic and affects the QUIC protocol implementation.
Affected products
- Microsoft QUIC
Timeline
- 2026-10-13: disclosed