busybox: busybox: httpd silently fails open when IP deny rules contain invalid CIDR prefix lengths

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...

SUSE CVE-2026-88831

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...

AZL-105131 CVE-2026-88831 affecting package busybox 1.36.1-28

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...

DEBIAN-CVE-2026-88831

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...

CVE-2026-88831

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...

CVE-2026-88831

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...

UBUNTU-CVE-2026-88831

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...

EUVD-2026-85509

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...

CVE-2026-88831 Busybox: busybox: httpd silently fails open when ip deny rules contain invalid cidr prefix lengths

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...

CVE-2026-88831

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...

CVE-2026-88831 Busybox: busybox: httpd silently fails open when ip deny rules contain invalid cidr prefix lengths

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...

CVE-2026-88831

The BusyBox httpd component is vulnerable to a security bypass where IP deny rules with invalid CIDR prefix lengths fail open. The system leaves a parsed IP with a zeroed mask, causing the rule to match no clients and allowing potentially unauthorized access. To mitigate this, users should audit ...

CVE-2026-88831

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...

CVE-2026-88831

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. Mitigation Audit all BusyBox httpd configuration files for syntactically valid CIDR prefix lengths. Implement network-level access controls...

PT-2026-97426

Name of the Vulnerable Software and Affected Versions BusyBox versions prior to 1.38.0-3.1 Description The httpd component in BusyBox handles IP deny rules incorrectly when invalid CIDR prefix lengths are provided. This causes the system to fail open, resulting in a parsed IP with a zeroed mask,...

PT-2026-105035

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...

CVE-2026-88831: Not Failing Securely

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...