CVE-2026-88831

medium

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.

References

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-85509

https://bugzilla.redhat.com/show_bug.cgi?id=2531346

https://access.redhat.com/security/cve/CVE-2026-88831

https://access.redhat.com/errata/RHSA-2026:72111

Details

Source: Mitre, NVD

Published: 2026-09-23

Updated: 2026-09-25

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Severity: Medium

EPSS

EPSS: 0.00236