How severe is CVE-2026-40079?

CVE-2026-40079 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40079 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40079?

CVE-2026-40079 affects Cacti. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40079?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-40079 have an EU (EUVD) identifier?

Yes. CVE-2026-40079 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39150.

When was CVE-2026-40079 published?

CVE-2026-40079 was published on 2026-06-25 and last updated on 2026-06-26.

CVE-2026-40079

CVE-2026-40079 is a critical-severity vulnerability in Cacti with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.6
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39150
Weakness: CWE-78
Affected product: Cacti
Published: 2026-06-25
Last modified: 2026-06-26

Description

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.

Frequently asked questions

What is CVE-2026-40079?: 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.
How severe is CVE-2026-40079?: CVE-2026-40079 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40079 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40079?: CVE-2026-40079 affects Cacti. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40079?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-40079 have an EU (EUVD) identifier?: Yes. CVE-2026-40079 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39150.
When was CVE-2026-40079 published?: CVE-2026-40079 was published on 2026-06-25 and last updated on 2026-06-26.

References

Affected products (1)

cpe:2.3:a:cacti:cacti:*:*:*:*:*:*:*:*

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