CVE-2026-39894
LOWCVSS v3.1: 2.9 · EPSS: 0.0012 (1.9 percentile)
Source data as of:
At a glance
- Severity
- LOW
- CVSS
- 2.9 v3.1 · NVD
- EPSS
- 0.0012 (1.9 percentile) · FIRST.org
- CISA KEV
- No
- Attack conditions (CVSS vector)
- No privilegesNo user interaction · Source: NVD Vector
- Affected vendors
- cacti
- Published
- 2026-06-24 · Modified: 2026-06-25
- References
- Jump to references (3)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
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.
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.