PT-2026-52129 · Cacti · Cacti

Published 2026-06-24 · Updated 2026-06-24 · CVE-2026-39894

Mitre

CVSS v3.1

2.9

Low

Base vector

AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Fix

Weakness Enumeration

CWE-474

Related Identifiers

CVE-2026-39894

Affected Products

Cacti

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-39894 · Security Note
• https://github.com/Cacti/cacti/issues/7011 · Note
• https://github.com/Cacti/cacti/commit/d2a698854956e9e4e53da9eab5b5719ae40e6893 · Note
• https://github.com/Cacti/cacti/security/advisories/GHSA-23g4-vf2j-94w4 · Note