CVE-2026-70096 — Windows Rich Text Edit Control Remote Code Execution Vulnerability

Executive Summary

Heap-based buffer overflow in Windows Rich Text Edit Control allows an unauthorized attacker to execute code over a network.

Overview

9.8

CVSS CRITICAL

Important

MS Severity

Not Exploited

MS Exploit Status

Exploitation Unlikely

MS Exploit Likelihood

Category Remote Code Execution

Weakness CWE-122: Heap-based Buffer Overflow

Released Oct 13 2026

Last Updated Oct 13 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 8.5

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

41 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft 365 Apps for Enterprise for 32-bit Systems	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft 365 Apps for Enterprise for 64-bit Systems	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft Office 365 for Mac	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft Office LTSC 2021 for 32-bit editions	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft Office LTSC 2021 for 64-bit editions	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft Office LTSC 2024 for 32-bit editions	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft Office LTSC 2024 for 64-bit editions	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft Office LTSC for Mac 2021	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft Office LTSC for Mac 2024	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Windows 10 Version 1607 for 32-bit Systems	`5126868 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1607 for x64-based Systems	`5126868 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1809 for 32-bit Systems	`5126651 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1809 for x64-based Systems	`5126651 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 21H2 for 32-bit Systems	`5126657 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 21H2 for ARM64-based Systems	`5126657 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 21H2 for x64-based Systems	`5126657 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 22H2 for 32-bit Systems	`5126657 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 22H2 for ARM64-based Systems	`5126657 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 22H2 for x64-based Systems	`5126657 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 23H2 for ARM64-based Systems	`5126653 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 23H2 for x64-based Systems	`5126653 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 24H2 for ARM64-based Systems	`5127648 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 24H2 for x64-based Systems	`5127648 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 25H2 for ARM64-based Systems	`5127648 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 25H2 for x64-based Systems	`5127648 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 26H1 for ARM64-based Systems	`5127646 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 version 26H1 for x64-based Systems	`5127646 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 26H2 for ARM64-based Systems	`5127648 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 26H2 for x64-based Systems	`5127648 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2012	`5126835 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2012 (Server Core installation)	`5126835 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2012 R2	`5126836 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2012 R2 (Server Core installation)	`5126836 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2016	`5126868 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2016 (Server Core installation)	`5126868 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2019	`5126651 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2019 (Server Core installation)	`5126651 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2022	`5126655 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2022 (Server Core installation)	`5126655 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2025	`5126646 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2025 (Server Core installation)	`5126646 (Security Update)`	Important	Remote Code Execution	Yes

Patches

11 patches

Article	Type	Restart
`Release Notes`	Security Update	Unknown
`5126868`	Security Update	Yes
`5126651`	Security Update	Yes
`5126657`	Security Update	Yes
`5126653`	Security Update	Yes
`5127648`	Security Update	Yes
`5127646`	Security Update	Yes
`5126835`	Security Update	Yes
`5126836`	Security Update	Yes
`5126655`	Security Update	Yes
`5126646`	Security Update	Yes

Exploits & PoC

No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

pwn2addr

References

MSRC Advisory MITRE NVD