Windows BitLocker Vulnerability Allows Attackers to Execute Malicious Code Remotely
Microsoft patched CVE-2026-69449, a heap-based buffer overflow in Windows BitLocker enabling code execution, affecting Windows 10/11 and Server 2012-2025 in September 2026 updates.
Microsoft disclosed CVE-2026-69449, a heap-based buffer overflow in Windows BitLocker rated Important, which could allow an authorized attacker to execute arbitrary code locally, with possible in-network exploitation via arbitrary endpoint calls. Microsoft rates exploitation as Less Likely and there was no public disclosure or in-the-wild exploitation at release. The flaw affects Windows 10 (1607-22H2), Windows 11 (23H2-26H1), and Windows Server 2012 through 2025, including Server Core. Fixes shipped in the September 2026 Patch Tuesday cumulative updates via platform-specific KBs such as KB5124012 and KB5122871.
- Heap-based buffer overflow in BitLocker enables local and potentially in-network arbitrary code execution
- Affects Windows 10, Windows 11, and Windows Server 2012-2025, including Server Core variants
- Rated Important with Exploitation Less Likely; no evidence of active exploitation as of disclosure
- Remediated via September 2026 Patch Tuesday cumulative updates, e.g. KB5124012 and KB5122871
- Researchers from Hong Kong Polytechnic University, Huazhong University of Science and Technology, and Diffract credited
- CVEs
- CVE-2026-69449
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-69449 | Heap-Based Buffer Overflow in Windows BitLocker Enables Local Code Execution | 6.7 | <1% |
From the original article
2 min read at cybersecuritynews.com
Microsoft has disclosed a new security flaw in Windows BitLocker, the operating system’s built-in disk encryption feature, that could let an attacker execute malicious code on a vulnerable device. Tracked as CVE-2026-69449 and published on September 8, 2026, the vulnerability stems from a heap-based buffer overflow in BitLocker’s code and has been rated “Important” in […]
By Guru Baran · cybersecuritynews.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.