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CVE record · CVE-2026-18839

Popt-devel: popt-static: size_t underflow in singleoptionhelp

CVSS 2.2 LowEPSS 0.0013 · 2nd percentile

Published by the CVE Program (CNA: redhat) at 5 Aug 2026, 20:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
rpm-software-management popt Package name: popt https://github.com/rpm-software-management/popt
  • affected 1.13 to before * semver
Other versions: unaffected
Red Hat Red Hat Hardened Images Package name: popt-main https://catalog.redhat.com/software/containers/
  • unaffected 1.19-11.2.hum1 to before * rpm
Other versions: affected
Red Hat Red Hat Enterprise Linux 10 Package name: popt https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: affected
Red Hat Red Hat Enterprise Linux 6 Package name: popt https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: unknown
Red Hat Red Hat Enterprise Linux 7 Package name: popt https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: affected
Red Hat Red Hat Enterprise Linux 8 Package name: popt https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: affected
Red Hat Red Hat Enterprise Linux 9 Package name: popt https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: affected
Red Hat Red Hat OpenShift Container Platform 4 Package name: openshift/ose-rhel-coreos-8 https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: affected
Red Hat Red Hat OpenShift Container Platform 4 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: affected
Identifiers
CVE-2026-18839
CNA
redhat
Weakness (CWE)
CWE-191
Tags
Published
5 Aug 2026
Updated
16 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
2.2 Low 3.1 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0013, the 2nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 5 Aug 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.