PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-20846 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-02-10T18:16:22.797Z and has not been modified since then. The CVE-2026-20846 vulnerability is a buffer over-read in Windows GDI+ that could allow an unauthorized attacker to deny service over a network. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. Multiple Windows versions and server editions are affected, including Windows 10, Windows 11, and Windows Server 2012 through 2025. Organizations using affected versions of Windows and Windows Server should prioritize patching this vulnerability to prevent potential denial-of-service attacks. It is recommended to apply patches from Microsoft for the affected Windows versions and server editions, conduct a thorough inventory of Windows systems and servers to identify those that may be vulnerable, implement compensating controls such as network segmentation and monitoring for suspicious activity, verify that systems have the latest security updates installed, and monitor for any signs of exploitation or anomalous behavior.

Vendor
Microsoft
Product
Microsoft Office for Android
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-02-10
Original CVE updated
2026-08-19
Advisory published
2026-02-10
Advisory updated
2026-08-19

Who should care

Organizations using affected versions of Windows and Windows Server should prioritize patching this vulnerability to prevent potential denial-of-service attacks.

Technical summary

The CVE-2026-20846 vulnerability is a buffer over-read in Windows GDI+ that could allow an unauthorized attacker to deny service over a network. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. Multiple Windows versions and server editions are affected, including Windows 10, Windows 11, and Windows Server 2012 through 2025.

Defensive priority

Organizations should prioritize patching Windows GDI+ vulnerabilities, especially in environments with internet-facing systems.

Recommended defensive actions

  • Apply patches from Microsoft for the affected Windows versions and server editions.
  • Conduct a thorough inventory of Windows systems and servers to identify those that may be vulnerable.
  • Implement compensating controls such as network segmentation and monitoring for suspicious activity.
  • Verify that systems have the latest security updates installed.
  • Monitor for any signs of exploitation or anomalous behavior.

Evidence notes

The CVE-2026-20846 record indicates a buffer over-read in Windows GDI+ that could allow an unauthorized attacker to deny service over a network. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. Multiple Windows versions and server editions are affected, including Windows 10, Windows 11, and Windows Server 2012 through 2025.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20846 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20846

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

  • CVE-2026-20846 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20846

    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.