Stack Buffer Overflow in Lighttpd Affects Remote Code Execution
CVE-2026-22903

9.8CRITICAL

Key Information:

Vendor

Wago

Status
0852-1322
0852-1328
Vendor
CVE Published:
9 February 2026

What is CVE-2026-22903?

A vulnerability in the modified Lighttpd server allows unauthenticated remote attackers to exploit an overly long SESSIONID cookie through a specially crafted HTTP request. This can lead to a stack buffer overflow, causing the server to crash and potentially enabling remote code execution due to inadequate stack protections. Urgent updates are recommended to mitigate risks associated with this vulnerability.

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Affected Version(s)

0852-1322 0.0.0 <= 2.64

0852-1322 2.64

0852-1328 0.0.0 <= 2.64

References

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

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Diconium
JSON
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