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.
Published: 2026-09-23
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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.

Tracking

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Advisories

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History

Fri, 25 Sep 2026 22:45:00 +0000

Type Values Removed Values Added
References

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'}


Subscriptions

Busybox Busybox
Redhat Hardened Images Hummingbird
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-25T22:28:19.246Z

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: 2026-09-25T23:16:54.457

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