CVE-2026-22903
Critical
Description
An unauthenticated remote attacker can send a crafted HTTP request containing an overly long SESSIONID cookie. This can trigger a stack buffer overflow in the modified lighttpd server, causing it to crash and potentially enabling remote code execution due to missing stack protections.
SeverityCritical
CVSS9.8
Exploit probability—
ProductWago 0852-1322
PublishedFeb 9, 2026
First seenFeb 9, 2026
Weakness typeCWE-121CWE-121
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| WAGO 0852-1322 | v ≤ 2.64, 2.64 | — |
| WAGO 0852-1328 | v ≤ 2.64, 2.64 | — |
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