AI and data stack advisories

Severe, 6 weeks977Projects326

977 severe, 6 weeks · 326 projects

WatchGuard TechnologiesCVE-2026-93866

WatchGuard Technologies Fireware OS: integer overflow

WatchGuard Technologies

CVE-2026-93866 · Published Oct 27, 2026 · updated Oct 28, 2026

Critical9.2
Fix: upgrade to 2026.4 or later (3 fixed versions below)
WatchGuard Technologies advisory

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.

Affected versions

PackageAffectedFixed in
Fireware OS
Product
>= 2025.1, < 2026.42026.4
>= 12.0, < 12.12.412.12.4
>= 12.0, < 12.5.2212.5.22
Details and references
CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-190, CWE-288, CWE-787

More WatchGuard Technologies advisories

All WatchGuard Technologies
High 8.7Oct 27WatchGuard Technologies Fireware OS: XPath injectionCVE-2026-93434fixed in 12.5.22 +2Critical 9.2Oct 27WatchGuard Technologies Fireware OS: stack buffer overflowCVE-2026-93857fixed in 2026.4 +2High 7.2Oct 27WatchGuard Technologies Fireware OS: out-of-bounds readCVE-2026-93862fixed in 2026.4 +2High 7.1Oct 27WatchGuard Technologies Fireware OS: code executionCVE-2026-93864fixed in 2026.4 +2Critical 9.2Oct 27WatchGuard Technologies Fireware OS: missing authenticationCVE-2026-93865fixed in 2026.4 +2Medium 5.7Oct 27WatchGuard Technologies Fireware OS: improper authenticationCVE-2026-82332fixed in 2026.4 +1