CVE-2026-85822 — Microsoft
HIGHCVE-2026-85822 is a high-severity (CVSS 7.8) CWE-122 vulnerability. No vendor fix is recorded yet; mitigation options are listed below.
Heap-based buffer overflow in Windows exFAT File System allows an authorized attacker to elevate privileges locally.
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-85822.
Description
Heap-based buffer overflow in Windows exFAT File System allows an authorized attacker to elevate privileges locally.
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2026-85822 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.
Frequently Asked Questions
Is CVE-2026-85822 in your dependencies?
Find it across , including transitive dependencies.