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PatchSiren cyber security CVE debrief

CVE-2026-20829 Microsoft CVE debrief

The CVE-2026-20829 record describes an out-of-bounds read vulnerability in Windows TPM, allowing an authorized local attacker to disclose information. This vulnerability has a CVSS score of 5.5 and is classified as MEDIUM severity. Affected products include Windows 10, Windows 11, and Windows Server versions. Microsoft has provided a vendor advisory for mitigation. Organizations should prioritize patching and monitoring, and security teams should review system logs and implement compensating controls to limit local access. The CVE record was published on 2026-01-13T18:16:10.657Z and has not been modified since then. The vulnerability impacts Windows systems, and defenders should focus on information disclosure risks in Windows TPM. To address this vulnerability, defenders should verify system configurations, review system logs for suspicious activity, and implement compensating controls to limit local access.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-13
Original CVE updated
2026-07-30
Advisory published
2026-01-13
Advisory updated
2026-07-30

Who should care

Organizations using affected Windows systems should prioritize patching and monitoring. Security teams should review system logs and implement compensating controls to limit local access. Defenders should focus on information disclosure risks in Windows TPM and verify system configurations. The vulnerability impacts Windows systems, and defenders should review system logs for suspicious activity and implement compensating controls to limit local access.

Technical summary

CVE-2026-20829 is an out-of-bounds read vulnerability in Windows TPM, allowing an authorized local attacker to disclose information. The vulnerability has a CVSS score of 5.5 and is classified as MEDIUM severity. Affected products include Windows 10, Windows 11, and Windows Server versions. Microsoft has provided a vendor advisory for mitigation. The vulnerability impacts Windows systems, and defenders should focus on information disclosure risks in Windows TPM.

Defensive priority

Medium-priority defensive actions are recommended for CVE-2026-20829, focusing on information disclosure risks in Windows TPM.

Recommended defensive actions

  • Inventory and assess Windows systems for potential exposure
  • Apply vendor patches or updates as available
  • Monitor system logs for suspicious activity
  • Implement compensating controls to limit local access
  • Review and update incident response plans

Evidence notes

The CVE-2026-20829 record indicates an out-of-bounds read vulnerability in Windows TPM, allowing local information disclosure. Affected products include various Windows 10, Windows 11, and Windows Server versions. Microsoft has provided a vendor advisory for mitigation. The evidence is based on the official CVE record and NVD detail page. Defenders should verify system configurations, review system logs for suspicious activity, and implement compensating controls to limit local access. The vulnerability has a CVSS score of 5.5 and is classified as MEDIUM severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20829 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20829

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

  • CVE-2026-20829 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20829

    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.