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CVE-2026-85790ImportantFix has a known issueInformation DisclosureNetworkRevised 16 Oct

Microsoft QUIC Information Disclosure Vulnerability

MSRC advisory NVD CVE.org

Assessment

Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.

Severity
Important
CVSS base score
5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Impact
Information Disclosure
EPSS, next 30 days
0.8%Higher than 56.4% of scored CVEs · FIRST model run 25 Oct 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
Microsoft QUIC
Weakness
CWE-416: Use After Free
Issued by
Microsoft
Published
13 Oct 2026 · October 2026
Last revised
16 Oct 2026Updated the Security Updates table to add download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
HighAC:H
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
NoneI:N
Availability
NoneA:N

Updates that fix it

5 KBs
KBTypeRestartApplies toKnown issuesOther CVEs
KB5126646 Security UpdateRequiredWindows Server 2025, Windows Server 2025 (Server Core installation)MitigatedUsers might be unable to sign in to OWA or send emails on Exchange ServerAll CVEs in KB5126646
KB5126653 Security UpdateRequiredWindows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based SystemsNone listedAll CVEs in KB5126653
KB5126655 Security UpdateRequiredWindows Server 2022, Windows Server 2022 (Server Core installation)MitigatedUsers might be unable to sign in to OWA or send emails on Exchange ServerAll CVEs in KB5126655
KB5127646 Security UpdateRequiredWindows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based SystemsNone listedAll CVEs in KB5127646
KB5127648 Security UpdateRequiredWindows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 3 moreNone listedAll CVEs in KB5127648

Affected products

Developer Tools, Other, Windows
20 affected products

What changed

First observed 14 Oct 2026
  1. 25 Oct 2026 · 17:12:51 UTC EPSS0.7%; scored 24 Oct 2026 → 0.8%; scored 25 Oct 2026
  2. 25 Oct 2026 · 01:34:18 UTC EPSS0.7%; scored 23 Oct 2026 → 0.7%; scored 24 Oct 2026
  3. 23 Oct 2026 · 15:51:28 UTC EPSS0.7%; scored 22 Oct 2026 → 0.7%; scored 23 Oct 2026
  4. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  5. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  6. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  7. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  8. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  9. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  10. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  11. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  12. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
Show 17 more recent changes
  1. 23 Oct 2026 · 08:31:50 UTCSource coverage: first-epss Current → Incomplete
  2. 23 Oct 2026 · 08:31:50 UTCSource coverage: cisa-kev Current → Incomplete
  3. 23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
  4. 22 Oct 2026 · 22:02:57 UTCAffected products Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.Native.Quic.MsQuic.Schannel on .NET 10.0 installed on Windows, Microsoft.Native.Quic.MsQuic.Schannel on .NET 11.0 installed on Windows, Microsoft.Native.Quic.MsQuic.Schannel on .NET 8.0 installed on Windows, Microsoft.Native.Quic.MsQuic.Schannel on .NET 9.0 installed on Windows, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 26H2 for x64-based Systems, Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation) → Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.Native.Quic.MsQuic.Schannel on .NET 10.0 runtime installed on Windows, Microsoft.Native.Quic.MsQuic.Schannel on .NET 11.0 runtime installed on Windows, Microsoft.Native.Quic.MsQuic.Schannel on .NET 8.0 runtime installed on Windows, Microsoft.Native.Quic.MsQuic.Schannel on .NET 9.0 runtime installed on Windows, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 26H2 for x64-based Systems, Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
  5. 22 Oct 2026 · 17:33:15 UTCEPSS 0.7%; scored 21 Oct 2026 → 0.7%; scored 22 Oct 2026
  6. 21 Oct 2026 · 21:47:24 UTCEPSS 0.7%; scored 20 Oct 2026 → 0.7%; scored 21 Oct 2026
  7. 20 Oct 2026 · 20:53:31 UTCEPSS 0.7%; scored 19 Oct 2026 → 0.7%; scored 20 Oct 2026
  8. 19 Oct 2026 · 15:12:40 UTCEPSS 0.7%; scored 18 Oct 2026 → 0.7%; scored 19 Oct 2026
  9. 18 Oct 2026 · 14:54:30 UTCEPSS 0.7%; scored 16 Oct 2026 → 0.7%; scored 18 Oct 2026
  10. 18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves
  11. 17 Oct 2026 · 07:28:24 UTCRevision note Updated the Security Updates table to add KB article links for .NET 11.0. This is an informational change only; the fixed builds are unchanged. → Updated the Security Updates table to add download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.
  12. 17 Oct 2026 · 07:28:24 UTCLast revised 15 Oct 2026 07:00 UTC → 16 Oct 2026 07:00 UTC
  13. 16 Oct 2026 · 16:13:25 UTCEPSS 0.7%; scored 15 Oct 2026 → 0.7%; scored 16 Oct 2026
  14. 15 Oct 2026 · 21:30:54 UTCRevision note Information published. → Updated the Security Updates table to add KB article links for .NET 11.0. This is an informational change only; the fixed builds are unchanged.
  15. 15 Oct 2026 · 21:30:54 UTCLast revised 13 Oct 2026 07:00 UTC → 15 Oct 2026 07:00 UTC
  16. 15 Oct 2026 · 21:30:54 UTCEPSS 0.7%; scored 14 Oct 2026 → 0.7%; scored 15 Oct 2026
  17. 15 Oct 2026 · 01:07:54 UTCEPSS Not scored → 0.7%; scored 14 Oct 2026

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Explore global source statements, affected packages and advisory history for CVE-2026-85790. The catalog has a separate collection scope from Microsoft release records.

Explicit identifiers and source references

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-85790 · Microsoft / collected KEV context

GHSA-2mxg-prvg-9jfg

cve-program · CVE-2026-85790

nvd · CVE-2026-85790

osv · GHSA-2mxg-prvg-9jfg

Related operational evidence

Explicit CVE identifiers
ChangeIntel

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