Information disclosure via use after free
Published Oct 13, 2026 · Updated Oct 13, 2026
Use after free in Microsoft QUIC allows remote attackers to disclose information through network interaction with affected installations. The available CNA record does not identify the affected function, freed object, or triggering input, and its sole vendor reference was inaccessible. Exploitation requires network reachability without authentication or user interaction; the published impact is information disclosure, not code execution or service interruption.
Summary
What happened
Use after free in Microsoft QUIC allows remote attackers to disclose information through network interaction with affected installations. The available CNA record does not identify the affected function, freed object, or triggering input, and its sole vendor reference was inaccessible. Exploitation requires network reachability without authentication or user interaction; the published impact is information disclosure, not code execution or service interruption.
The record
- CVE
- CVE-2026-85790
- Published
- Oct 13, 2026
- Updated
- Oct 13, 2026
- Vendor
- Microsoft Corporation
- Product
- Microsoft.Native.Quic.MsQuic.Schannel
- Classifications
- CWE-416
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 13, 2026CVE publishedPublication date reported by the CVE source.
- Oct 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.9.0 <2.6.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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