CVE-2026-40079: Cacti is an open source performance and fault manageme
CVE-2026-40079 analysis covering impact, affected products, versions, remediation, and cross-checked defender guidance.
CVE-2026-40079 is a vulnerability published by NVD on 6/25/2026.
What happened
Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Command Injection due to lack of sanitization in the escape_command() function. The escape_command() function at lib/rrd.php is a no-op: it returns $command unchanged. The command line built by rrdtool_function_graph() is passed through this function and then to shell_exec($full_commandline). The risk is in __rrd_execute() where text_format values from graph templates (which may contain host variable substitutions) reach shell_exec without adequate escaping. This issue has been addressed in version 1.2.31.
Affected products and versions
- cacti cacti unspecified version (before 1.2.31)
Severity and weakness
CVSS: CRITICAL 9.8. Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Weaknesses: CWE-78, CWE-88.
Known exploitation
No CISA KEV entry is currently attached to the NVD record.
What defenders should do
- Identify whether the affected product and version range exists in production.
- Review vendor advisories and release notes before change windows.
- Patch, upgrade, disable the vulnerable component, or apply vendor mitigations.
- Verify the running version after deployment, not only the package inventory.
Official and supporting references
- https://github.com/Cacti/cacti/commit/4c09efaebf3a9faec66969d0b5c4aceaf397f37f
- https://github.com/Cacti/cacti/security/advisories/GHSA-xq98-376r-hv9j