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PatchSiren cyber security CVE debrief

CVE-2026-27931 Microsoft CVE debrief

The Windows GDI Information Disclosure Vulnerability is a medium-severity vulnerability that allows an unauthorized attacker to disclose information locally due to an out-of-bounds read in Windows GDI. The CVE record was published on 2026-04-14T16:57:17.253Z and has not been modified since then. The NVD entry is currently Medium. Defenders responsible for Windows GDI deployments, particularly those using affected versions, should assess exposure and apply patches from Microsoft. The vulnerability requires verification of exposure and patching to prevent potential information disclosure.

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders responsible for Windows GDI deployments, particularly those using affected versions, should assess exposure and apply patches from Microsoft. Additionally, security teams and vulnerability management teams should review the vulnerability and assess the potential impact on their organization. Operators and administrators of affected systems should also be aware of the vulnerability and take necessary actions

Why it matters

The Windows GDI Information Disclosure Vulnerability requires verification of exposure and patching to prevent potential information disclosure.

  • Verify exposure in Windows GDI deployments
  • Apply patches from Microsoft to prevent potential information disclosure
  • Monitor for potential information disclosure due to out-of-bounds read in Windows GDI

Technical summary

The Windows GDI Information Disclosure Vulnerability allows an unauthorized attacker to disclose information locally due to an out-of-bounds read in Windows GDI. The vulnerability affects Windows GDI deployments, and defenders should prioritize verifying exposure and applying patches from Microsoft. The CVE record and source item provide details on the Windows GDI Information Disclosure Vulnerability, including affected versions and architectures.

Defensive priority

Defenders should prioritize verifying exposure in Windows GDI deployments and applying patches from Microsoft.

Recommended defensive actions

  • Verify exposure in Windows GDI deployments
  • Apply patches from Microsoft
  • Monitor for potential information disclosure

Evidence notes

The CVE record and source item provide details on the Windows GDI Information Disclosure Vulnerability, including affected versions and architectures.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-27931 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-27931

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

  • CVE-2026-27931 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-27931

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

Supplemental references

  • Windows GDI Information Disclosure Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/27xxx/CVE-2026-27931.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27931

    Supplemental source - vendor-advisory, patch

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.