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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

Audit all BusyBox httpd configuration files for syntactically valid CIDR prefix lengths. Implement network-level access controls (iptables/nftables) as the primary enforcement layer rather than relying on application-level ACLs.

History

Thu, 24 Sep 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Busybox
Busybox busybox
Redhat hardened Images
Vendors & Products Busybox
Busybox busybox
Redhat hardened Images

Thu, 24 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 23 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 23 Sep 2026 18:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Busybox: busybox: httpd silently fails open when ip deny rules contain invalid cidr prefix lengths
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-636
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-23T18:11:48.288Z

Reserved: 2026-09-10T09:42:04.559Z

Link: CVE-2026-88831

cve-icon Vulnrichment

Updated: 2026-09-23T18:10:58.581Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-23T18:17:10.080

Modified: 2026-09-24T14:51:56.593

Link: CVE-2026-88831

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-23T16:35:00Z

Links: CVE-2026-88831 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-24T09:10:34Z

Weaknesses