# CVE-2026-88243

Remote code execution via Windows DHCP Server out-of-bounds read.

- Page: https://www.vulneraibility.com/cve/CVE-2026-88243
- CVSS: 9.8
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 1.01% (percentile 63.4)
- CISA SSVC: exploitation none, automatable yes, technical impact total (assessed 2026-11-05)
- Weakness: CWE-125
- Published: 2026-11-10

## Affected versions

- Microsoft Windows Server 2016: affected >= 10.0.14393.0 and < 10.0.14393.9688
- Microsoft Windows Server 2016 (Server Core installation): affected >= 10.0.14393.0 and < 10.0.14393.9688
- Microsoft Windows Server 2019: affected >= 10.0.17763.0 and < 10.0.17763.9487
- Microsoft Windows Server 2019 (Server Core installation): affected >= 10.0.17763.0 and < 10.0.17763.9487
- Microsoft Windows Server 2022: affected >= 10.0.20348.0 and < 10.0.20348.5870
- Microsoft Windows Server 2025: affected >= 10.0.26100.0 and < 10.0.26100.33822
- Microsoft Windows Server 2025 (Server Core installation): affected >= 10.0.26100.0 and < 10.0.26100.33822

A version outside these ranges is not a statement that it is unaffected.

## Impact

Remote attacker can exploit DHCP server OOB read to achieve remote code execution and full system compromise, disrupting network services.

## Action

Immediate action required

## Recommendation

Apply Microsoft's security update immediately; restrict and isolate DHCP servers from untrusted networks.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88243

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.