Use of Function with Inconsistent Implementations Affecting cacti package, versions <1.2.31-0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ALPINE324-CACTI-17373374
- published18 Jun 2026
- disclosed24 Jun 2026
Introduced: 18 Jun 2026
CVE-2026-39894 (opens in a new tab)How to fix?
Upgrade Alpine:3.24 cacti to version 1.2.31-0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream cacti package and not the cacti package as distributed by Alpine.
See How to fix? for Alpine:3.24 relevant fixed versions and status.
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.