Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-88831
Red Hat Red Hat Hardened Images — Busybox: busybox: httpd silently fails open when ip deny rules contain invalid cidr prefix lengths
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U L N N 5.3 .0024 13.3 —
AFFECTED
Product Versions Fixed
Red Hat Hardened Images unspecified 1.37.0-9.1.hum1
TIMELINE
Sep 10 Reserved by redhat
Sep 23 Published (CNA: redhat)
Sep 25 PATCH SHIPPED — CVE-2026-88831 (Red Hat Hardened Images). Fixed in Red Hat Hardened Images 1.37.0-9.1.hum1.
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| September 10, 2026 | Reserved | Reserved by redhat |
| September 23, 2026 | Published | Published (CNA: redhat) |
| September 25, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-88831 (Red Hat Hardened Images). Fixed in Red Hat Hardened Images 1.37.0-9.1.hum1. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Hardened Images | — | — | 1.37.0-9.1.hum1 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-88831 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
