What’s Vulnerable › Vulnerabilities

CVE-2026-18739: Popt-devel: popt-static: off-by-one in poptstuffargs

• Severity: low (CVSS 2.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-04 · updated 2026-08-31
• Weakness: CWE-787

Description

A flaw was found in popt, a command-line option parsing library. An off-by-one error in the poptStuffArgs function, when repeatedly called by a host application or through deep alias nesting, can lead to corruption of internal program data. This corruption could potentially enable a local attacker to execute arbitrary code if the host application then unsafely processes the altered data.

Affected products

• Red Hat OpenShift Container Platform 4.18: all versions
• Red Hat Enterprise Linux 10: all versions
• Red Hat Enterprise Linux 6: all versions
• Red Hat Enterprise Linux 7: all versions
• Red Hat Enterprise Linux 8: all versions
• Red Hat Enterprise Linux 9: all versions
• Red Hat Hardened Images: all versions — fixed in 1.19-11.1.hum1
• rpm-software-management popt: from 1.1.1

How to fix

Upgrade to a fixed version: Red Hat Hardened Images 1.19-11.1.hum1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:56984
• https://access.redhat.com/security/cve/CVE-2026-18739
• https://bugzilla.redhat.com/show_bug.cgi?id=2510737

Get alerted when CVE-2026-18739 or the next vulnerability affects your stack