Vulnerability DatabaseCVE-2026-88831
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CVE-2026-88831
Published:September 23, 2026
Updated:October 11, 2026
BusyBox httpd IP deny rules with invalid CIDR prefix lengths fail open, leaving a parsed IP with a zeroed mask so the rule matches no clients.
Related Resources (3)
https://access.redhat.com/errata/RHSA-2026:72111
https://bugzilla.redhat.com/show_bug.cgi?id=2531346
https://access.redhat.com/security/cve/CVE-2026-88831
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Not Failing Securely ('Failing Open')
CWE-636
EPSS
Base Score:
0.24