Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-18839
rpm-software-management popt — Popt-devel: popt-static: size_t underflow in singleoptionhelp
AV AC PR UI S C I A CVSS EPSS %ile KEV
L H L R U N N L 2.2 .0013 2.1 —
AFFECTED
Product Versions Fixed
popt 1.13 – —
Red Hat Hardened Images unspecified 1.19-11.2.hum1
Red Hat Enterprise Linux 10 unspecified —
Red Hat Enterprise Linux 6 unspecified —
Red Hat Enterprise Linux 7 unspecified —
Red Hat Enterprise Linux 8 unspecified —
Red Hat Enterprise Linux 9 unspecified —
Red Hat OpenShift Container Platform 4 unspecified —
Red Hat OpenShift Container Platform 4 unspecified —
TIMELINE
Aug 4 Reserved by redhat
Aug 5 Published (CNA: redhat)
Oct 8 PATCH SHIPPED — CVE-2026-18839 (rpm-software-management popt). Fixed in Red Hat Hardened Images 1.19-11.2.hum1.
Description
An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| August 4, 2026 | Reserved | Reserved by redhat |
| August 5, 2026 | Published | Published (CNA: redhat) |
| October 8, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-18839 (rpm-software-management popt). Fixed in Red Hat Hardened Images 1.19-11.2.hum1. |
Affected
Affected products and packages — 9 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| rpm-software-management | popt | — | 1.13 | — |
| Red Hat | Red Hat Hardened Images | — | — | 1.19-11.2.hum1 |
| Red Hat | Red Hat Enterprise Linux 10 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-18839 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 Monday, October 19, 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.
