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CVE-2026-18739

2.5 · LOW

A flaw was found in popt, a command-line option parsing library.

Published Aug 4, 2026CWE-787EPSS 0.14%

Overview

CVE-2026-18739 is a low-severity vulnerability. It was published on August 4, 2026 and has a CVSS 3.1 base score of 2.5 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2026:56984Refaccess.redhat.com/security/cve/CVE-2026-18739Refbugzilla.redhat.com/show_bug.cgi?id=2510737

How CyberStrike helps

Frequently asked questions

What is CVE-2026-18739?

CVE-2026-18739 is a low-severity vulnerability. It was published on August 4, 2026 and has a CVSS 3.1 base score of 2.5 (LOW).

How severe is CVE-2026-18739?

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-18739?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-18739?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-18739 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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