CVE-2026-22903

Stack Overflow via SESSIONID Cookie in lighttpd

CVSS 9.8 CRITICALEPSS 0.7%CWE-121

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.8EPSS 0.7%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

09 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

WAGO · 0852-1322 WAGO · 0852-1328

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References

https://certvde.com/de/advisories/VDE-2026-004