CVE-2026-39938 Cacti: Unauthenticated RCE on Graph Image
Unauthenticated attackers can execute arbitrary code via Local File Inclusion and IPC serialization flaws in Cacti graph image handling.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-39938?
CVE-2026-39938 is a critical command injection vulnerability in Cacti Cacti, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have unauthenticated LFI through graph_theme and rrdtool IPC serialization hardening. This issue has been resolved in version 1.2.31.
Which versions are affected by CVE-2026-39938?
It affects 1 product.
Products include Cacti Cacti.
How do I fix CVE-2026-39938?
Upgrade to a fixed version.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-39938 being exploited?
There is no known exploitation of CVE-2026-39938 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in Cacti Cacti
- CVE-2022-46169 Cacti Command Injection
- CVE-2026-39893 Cacti: Pre-authentication SQL injection via rfilter RLIKE clause in graph_view.php
- CVE-2026-39955 Cacti has Pre-Authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php
- CVE-2023-39361 Unauthenticated SQL Injection in graph_view.php in Cacti
- CVE-2022-0730 Auth bypass in Cati
Sources
Also known as DEBIAN-CVE-2026-39938, GHSA-rm7p-qcqm-x5m6, UBUNTU-CVE-2026-39938.