CVE-2026-93866

An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.

Score

CVSS 4.0 9.2 Critical

Status

Awaiting Analysis - 5d1c2695-1a31-4499-88ae-e847036fd7e3

Published

2026-10-27

Last modified

2026-10-28

Weaknesses

CWE-190, CWE-288, CWE-787

Affected products

• Fireware Os (Watchguard)

References

• https://psirt.watchguard.com/CVE-2026-93866