CVE-2026-22904 CRITICAL

CVE-2026-22904: Stack Overflow via Oversized Cookie Fields in lighttpd

Vendor Wago
Product 0852-1322
Weakness CWE-121
Published February 9, 2026
Last update February 9, 2026

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

Improper length handling when parsing multiple cookie fields (including TRACKID) allows an unauthenticated remote attacker to send oversized cookie values and trigger a stack buffer overflow, resulting in a denial‑of‑service condition and possible remote code execution.

Key dates

02Disclosure timeline

February 9, 2026 CVE published
February 9, 2026 Record updated