CVE-2026-88831
Busybox: busybox: httpd silently fails open when ip deny rules contain invalid cidr prefix lengths
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 23, 2026
- Updated
- Sep 25, 2026
- Reserved
- Sep 10, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N | redhat |
Weaknesses
- CWE-636 Not Failing Securely ('Failing Open')
Affected Products
| Product | Versions |
|---|---|
Red Hat Hardened ImagesRed Hat |
|
References
- RHSA-2026:72111vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-88831vdb-entry
- RHBZ#2531346issue-tracking
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