Vulnerability in Red Hat Hardened Images

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.

Published 2026-09-23 · last modified 2026-09-23.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Red Hat Hardened Images

Weakness classification (CWE)

CWE-636

References

access.redhat.com/security/cve/CVE-2026-88831 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-88831?: CVE-2026-88831 is a medium-severity vulnerability in Red Hat Hardened Images, classified under CWE-636. CVSS score: 5.3/10. Published 2026-09-23.
How severe is CVE-2026-88831?: Medium severity. CVSS v3 base score is 5.3 out of 10.