---
title: "CVE-2026-105016: Microsoft Security Advisory CVE-2026-105016 - Microsoft QUIC Remote Code Execution Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-105016/
description: "CVE-2026-105016 (Microsoft.Native.Quic.MsQuic.Schannel (NuGet)): Heap-based buffer overflow in Microsoft QUIC allows an unauthorized attacker to execute…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-10-13
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-105016"
kev: false
cvss: 9.8
epss: 0.00986
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-105016: Microsoft Security Advisory CVE-2026-105016 - Microsoft QUIC Remote Code Execution Vulnerability

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.0% , percentile 62: FIRST’s model estimates a 1.0% chance of exploitation activity in the next 30 days, higher than 62% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes Microsoft.Native.Quic.MsQuic.Schannel (NuGet) = 2.5.11-ci.156755675, fixed in 2.5.11-ci.159417053 . Check your lockfile, including transitive dependencies.

## What it is

Heap-based buffer overflow in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

## Affected packages

- NuGet `Microsoft.Native.Quic.MsQuic.Schannel` = 2.5.11-ci.156755675 → fixed: 2.5.11-ci.159417053

## Affected products (CVE record)

- Microsoft .NET 10.0: 10.0.0 < 10.0.14
- Microsoft .NET 11.0: 11.0.0 < 11.0.0-rc.2.26504.105
- Microsoft .NET 8.0: 8.0.0 < 8.0.32
- Microsoft .NET 9.0: 9.0.0 < 9.0.21
- Microsoft Microsoft Visual Studio 2022 version 17.14: 17.14.0 < 17.14.42
- Microsoft Microsoft Visual Studio 2026 version 18.10: 18.10.0 < 18.10.4
- Microsoft Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7652
- Microsoft Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7652
- Microsoft Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9711
- Microsoft Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9711

## Severity

- microsoft CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.99% probability of exploitation activity in the next 30 days; percentile 62.

## Sources

- [Microsoft QUIC Remote Code Execution Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105016)
- [GitHub Advisory GHSA-5gjq-3f94-rcf7](https://github.com/advisories/GHSA-5gjq-3f94-rcf7)
- [CVE.org record CVE-2026-105016](https://www.cve.org/CVERecord?id=CVE-2026-105016)
- [NVD entry CVE-2026-105016](https://nvd.nist.gov/vuln/detail/CVE-2026-105016)
- [github.com](https://github.com/dotnet/runtime/security/advisories/GHSA-5gjq-3f94-rcf7)
- [github.com](https://github.com/dotnet/announcements/issues/446)
- [github.com](https://github.com/dotnet/runtime/issues/135695)

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Source page: https://erroneo.us/security/cve/CVE-2026-105016/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt