CVE-2026-88070: Windows BitLocker out-of-bounds read privilege escalation

CVE-2026-88070 · Severity: high · CVSS 7.8 · Published 2026-10-13

Windows BitLocker, which encrypts and protects data on drives, contains an out-of-bounds memory read vulnerability that allows an authorized local user to escalate their privileges on the system. An attacker with local access can exploit this flaw to gain higher privilege levels and take control of the machine.

Technologies: Microsoft Windows BitLocker, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows 11 26h2, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025. Vendors: Microsoft.

Quick answers

Is CVE-2026-88070 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-88070 being exploited in the wild.
How severe is CVE-2026-88070?
High severity, with a CVSS score of 7.8, published 13 October 2026.
Which products and versions are affected?
Microsoft Windows BitLocker.
Is there a fix for CVE-2026-88070?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-88070 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2026-88070?
Check whether you run Microsoft Windows BitLocker, Microsoft Windows 10 1607, Microsoft Windows 10 1809 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds read in Windows BitLocker allows an authorized local attacker to trigger a memory access violation and escalate privileges on the system. The vulnerability requires local access and existing user credentials. Successful exploitation grants the attacker elevated privileges.

Affected products

  • Microsoft Windows BitLocker

Timeline

  • 2026-10-13: disclosed

References

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