CVE-2026-22903

CRITICAL
2026-02-09 [email protected]
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Feb 09, 2026 - 08:16 nvd
CRITICAL 9.8

Tags

RCE Buffer Overflow Denial Of Service

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.

Analysis

A device has a stack-based buffer overflow in HTTP SESSION cookie processing allowing unauthenticated remote code execution.

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Remediation

Within 24 hours: Inventory all lighttpd deployments and assess exposure to untrusted networks; implement emergency WAF rules to block oversized SESSIONID cookies. Within 7 days: Deploy network segmentation to restrict direct internet access to affected servers and monitor for exploitation attempts. …

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Priority Score

50
Low Medium High Critical
KEV: 0
EPSS: +0.6
CVSS: +49
POC: 0

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CVE-2026-22903 vulnerability details – vuln.today
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