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CVE-2026-39894

2.9 · LOW

Cacti is an open source performance and fault management framework.

Published Jun 24, 2026CWE-474EPSS 0.14%

Overview

CVE-2026-39894 is a low-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 2.9 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.9, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

Cacti is an open source performance and fault management framework. In versions 1.2.30 and below, the locale-dependent decimal formatting in rrdtool_function_update() can corrupt RRDtool metric values. The rrdtool_function_update() function checks metric values with is_numeric() and concatenates them into the RRDtool update command via PHP string interpolation. PHP's string cast of floats is locale-sensitive: if LC_NUMERIC uses comma as decimal separator (e.g., de_DE), a value of 1.5 becomes "1,5". RRDtool expects . as decimal separator, causing metric data to shift into wrong columns or be silently dropped. No setlocale() reset is present in the update path. This causes a data integrity issue, but is not remotely exploitable; it requires server locale misconfiguration. The issue has been fixed in version 1.2.31.

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

GitHubgithub.com/Cacti/cacti/commit/d2a698854956e9e4e53da9eab5b5719ae40e6893GitHubgithub.com/Cacti/cacti/issues/7011GitHubgithub.com/Cacti/cacti/security/advisories/GHSA-23g4-vf2j-94w4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-39894?

CVE-2026-39894 is a low-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 2.9 (LOW).

How severe is CVE-2026-39894?

This vulnerability has a CVSS 3.1 base score of 2.9, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-39894?

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-2026-39894?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-39894 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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