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.

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
.