CVE-2026-85790
published 2026-10-13CVE-2026-85790: Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.
PriorityP337medium5.9CVSS 3.1
AVNACHPRNUINSUCHINAN
EPSS
0.69%
52.2th percentile
Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.
Affected
21 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft.native.quic.msquic.schannel | >= 1.9.0 < 2.6.2 | 2.6.2 |
| microsoft | microsoft.native.quic.msquic.schannel | >= 1.9.0 < 2.6.2 | 2.6.2 |
| microsoft | microsoft_visual_studio_2022_version_17.14 | >= 17.14.0 < 17.14.42 | 17.14.42 |
| microsoft | microsoft_visual_studio_2026_version_18.10 | >= 18.10.0 < 18.10.4 | 18.10.4 |
| microsoft | native.quic.msquic.schannel | < 2.6.2 | 2.6.2 |
| microsoft | visual_studio_2022 | >= 17.14.0 < 17.14.42 | 17.14.42 |
| microsoft | visual_studio_2026 | >= 18.10.0 < 18.10.4 | 18.10.4 |
| microsoft | windows_11_23h2 | < 10.0.22631.7652 | 10.0.22631.7652 |
| microsoft | windows_11_24h2 | < 10.0.26100.9711 | 10.0.26100.9711 |
| microsoft | windows_11_25h2 | < 10.0.26200.9711 | 10.0.26200.9711 |
| microsoft | windows_11_26h1 | < 10.0.28000.3231 | 10.0.28000.3231 |
| microsoft | windows_11_26h2 | < 10.0.26300.9711 | 10.0.26300.9711 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.7652 | 10.0.22631.7652 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.9711 | 10.0.26100.9711 |
| microsoft | windows_11_version_25h2 | >= 10.0.26200.0 < 10.0.26200.9711 | 10.0.26200.9711 |
| microsoft | windows_11_version_26h1 | >= 10.0.28000.0 < 10.0.28000.3231 | 10.0.28000.3231 |
| microsoft | windows_11_version_26h2 | >= 10.0.26300.0 < 10.0.26300.9711 | 10.0.26300.9711 |
| microsoft | windows_server_2022 | < 10.0.20348.5761 | 10.0.20348.5761 |
| microsoft | windows_server_2022 | >= 10.0.20348.0 < 10.0.20348.5761 | 10.0.20348.5761 |
| microsoft | windows_server_2025 | < 10.0.26100.33650 | 10.0.26100.33650 |
| microsoft | windows_server_2025 | >= 10.0.26100.0 < 10.0.26100.33650 | 10.0.26100.33650 |
CVSS provenance
nvdv3.15.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
ghsa5.9MEDIUM
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VulDB
Microsoft .NET up to 2.6.1 MsQuic.Schannel use after free
vuldb·2026-10-14·CVSS 5.9
CVE-2026-85790 [MEDIUM] Microsoft .NET up to 2.6.1 MsQuic.Schannel use after free
A vulnerability was found in Microsoft .NET up to 2.6.1. It has been classified as problematic. This impacts an unknown function of the component MsQuic.Schannel. The manipulation leads to use after free.
This vulnerability is referenced as CVE-2026-85790. Remote exploitation of the attack is possible. No exploit is available.
Upgrading the affected component is recommended.
GHSA
Microsoft Security Advisory CVE-2026-85790 - .NET Information Disclosure Vulnerability
ghsa·2026-10-13·CVSS 5.9
CVE-2026-85790 [MEDIUM] CWE-416 Microsoft Security Advisory CVE-2026-85790 - .NET Information Disclosure Vulnerability
Microsoft Security Advisory CVE-2026-85790 - .NET Information Disclosure Vulnerability
## Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.Native.Quic.MsQuic.Schannel. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
Various vulnerabilities in MsQuic are addressed by an updated native-binary dependency update.
## Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/470
## CVSS Details
- **Version:** 3.1
- **Severity:** Moderate
- **Score:** 5.9
- **Vector:** `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`
- **Weakness:** CWE-416 (Use After Free)
## Affected Platforms
- **Platforms:** Wind
No detection rules found.
No public exploits indexed.
Sans Isc
October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th)
blogs_sans_isc·2026-10-13·CVSS 8.8
CVE-2026-96951 [HIGH] October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th)
October 2026 Microsoft Patch Tuesday
Published: 2026-10-13. Last Updated: 2026-10-13 19:25:52 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
Microsoft today released patches for 1,417 vulnerabilities. 76 of these vulnerabilities are rated critical, with 7 critical vulnerabiilties requiring no customer actions. One vulnerability was disclosed before today's patch Tuesday, and one is already exploited.
CVE-2026-96951: An already exploited Windows Shell Security Feature Bypass Vulnerability. This vulnerabliity allows bypassing the "Mark of the Web" making it easier to exeucte code by sending a malicious message to a user via e-mail or instant messaging. The victim will still have to open the file.
CVE-2026-108398: This vulnerability, a .NET framework security feature bypass, could be
Rapid7
Patch Tuesday - October 2026
blogs_rapid7·2026-10-13·CVSS 8.8
CVE-2026-96951 [HIGH] Patch Tuesday - October 2026
Microsoft is publishing 1,413 own-product vulnerabilities on October 2026 Patch Tuesday , including 1,102 vulnerabilities in Windows. Anyone who enjoyed last month’s record-setting Patch Tuesday will love the October 2026 edition, because it’s much bigger still. As Rapid7 has noted over the course of 2026, there is every reason to suppose that vulnerability volumes will continue to rise. Microsoft is aware of exploitation in the wild for just one of the vulnerabilities published today, as well as public disclosure for two others.
## Windows Shell: zero-day security feature bypass
The Windows Shell is Microsoft’s term for the GUI interaction logic for the entire OS provided by explorer.exe and associated libraries and APIs, and for the second time this year , the Windows Shell is the site
2026-10-13
Published