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CVE-2026-85835 Microsoft CVE debrief

A buffer over-read vulnerability in Servicing Stack Updates allows an authorized local attacker to disclose information. This medium-severity issue affects multiple Windows 11 and Windows Server 2025 versions. Microsoft has released a patch, and defenders should prioritize verification and remediation efforts. The vulnerability is a buffer over-read issue that can lead to local information disclosure. Defenders should verify and remediate this issue, as it could allow unauthorized access to sensitive information on affected systems.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows 11 and Windows Server 2025 systems should assess exposure and prioritize remediation efforts. This includes reviewing system inventories, verifying affected versions, and applying the Microsoft patch. Security teams should also monitor for local unauthorized access attempts and review relevant logs.

Why it matters

CVE-2026-85835 is a medium-severity vulnerability in Servicing Stack Updates that allows local information disclosure. Defenders should verify and remediate this issue, as it could allow unauthorized access to sensitive information on affected Windows 11 and Windows Server 2025 systems.

  • Local information disclosure possible for authorized attackers
  • Verification of affected versions and patch application required
  • Monitoring for unauthorized local access attempts recommended

Technical summary

The Servicing Stack Updates Information Disclosure Vulnerability (CVE-2026-85835) is a buffer over-read issue that allows an authorized local attacker to disclose information. The vulnerability affects multiple versions of Windows 11 (24H2, 25H2, 26H1, 26H2) and Windows Server 2025. Microsoft has released a patch for this vulnerability.

Defensive priority

Defenders should verify and remediate this vulnerability, as it could allow local information disclosure.

Recommended defensive actions

  • Verify and apply the Microsoft patch for CVE-2026-85835
  • Inventory Windows 11 and Windows Server 2025 systems for affected versions
  • Monitor for local unauthorized access attempts

Evidence notes

The CVE record and source item provide details on the vulnerability, affected versions, and a reference to the Microsoft advisory. The vulnerability affects multiple versions of Windows 11 (24H2, 25H2, 26H1, 26H2) and Windows Server 2025. The Microsoft advisory provides guidance on patch application and verification. Defenders should review the advisory and verify affected systems.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-85835 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-85835

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-85835 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-85835

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.