Use of Function with Inconsistent Implementations in Cacti - CVE-2026-39894
Published: June 19, 2026
Vulnerability identifier: #VU134956
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-39894
CWE-ID: CWE-474
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: The Cacti Group, Inc.
Affected software:
Cacti
Cacti
Detailed vulnerability description
The vulnerability allows a remote attacker to corrupt metric values.
The vulnerability exists due to use of function with inconsistent implementations in rrdtool_function_update() when formatting numeric metric values for RRDtool updates. A remote attacker can cause locale-sensitive comma decimal formatting to be used to corrupt metric values.
Exploitation requires the server to use an LC_NUMERIC locale with a comma decimal separator.
How to mitigate CVE-2026-39894
Install security update from vendor's website.