CVE-2026-39894

CVE-2026-39894 affects Cacti (≤ 1.2.30). Locale-dependent decimal formatting in rrdtool_function_update() uses PHP string interpolation for metric values after is_numeric(), so a value like 1.5 may be rendered as 1,5 under LC_NUMERIC with a comma decimal. RRDtool expects a dot, causing metric dat...

CVE-2026-39894 Cacti: RRDtool metric shift via LC_NUMERIC locale comma decimal formatting

Cacti is an open source performance and fault management framework. In versions 1.2.30 and below, the locale-dependent decimal formatting in rrdtoolfunctionupdate can corrupt RRDtool metric values. The rrdtoolfunctionupdate function checks metric values with isnumeric and concatenates them into t...