🛡️ CVE-2026-39894 — cacti

🟢 CVSS 2.9 — Low ✅ No Known Exploit CWE-474 NVD
2.9
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability none.

Affected software

CVE-2026-39894 is recorded against 1 package.

  • cacti (fixed in 1.2.31)

Timeline and source

Published on 24 June 2026 and last revised on 25 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
github.com

Details

Severity LOW
CVSS Score 2.9
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE CWE-474
Public Exploit ✅ No
Source NVD
Published 2026-06-24
Updated 2026-08-11
Modified 2026-06-25

Affected Packages

Software From version Fixed in
cacti — 1.2.31

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