CVE-2026-39894
2.9 · LOWOverview
CVE-2026-39894 is a low-severity vulnerability affecting cacti cacti. 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 and patches from cacti. Update cacti to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| cacti | cacti | >= 0, < 1.2.31 | Affected |
Frequently Asked Questions
What is CVE-2026-39894?
CVE-2026-39894 is a low-severity vulnerability affecting cacti cacti. 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 and patches from cacti. Update cacti to the latest patched version. 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's AI-powered security agents can automatically detect CVE-2026-39894 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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