CVE-2026-105016 Microsoft QUIC Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft QUIC allows remote attackers to execute arbitrary code without authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-105016?
CVE-2026-105016 is a critical memory corruption vulnerability in Microsoft .NET 10.0 runtime, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Heap-based buffer overflow in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Weakness: CWE-122
Which versions are affected by CVE-2026-105016?
2 open source packages ship an affected version, including Microsoft.Native.Quic.MsQuic.Schannel.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.Native.Quic.MsQuic.Schannel NuGet | From 2.5.11-ci.156755675 | 2.5.11-ci.159417053 |
Microsoft.Native.Quic.MsQuic.Schannel NuGet | From 2.5.11-ci.156755675 | 2.5.11-ci.159417053 |
How do I fix CVE-2026-105016?
Upgrade Microsoft.Native.Quic.MsQuic.Schannel to 2.5.11-ci.159417053 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-105016 being exploited?
There is no known exploitation of CVE-2026-105016 in the wild and no public exploit code.
Sources
Also known as GHSA-5gjq-3f94-rcf7, UBUNTU-CVE-2026-105016.