CVE-2026-105331 mk-oracle: Local privilege escalation via malicious Oracle Instant Client
A local attacker with edit access to the Oracle Instant Client can escalate privileges in Checkmk if the mk-oracle agent plugin is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105331?
CVE-2026-105331 is a medium-severity vulnerability in Checkmk, published on 8 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Local privilege escalation in Checkmk 2.5.0 before 2.5.0p10 allows a user with access to edit the Oracle Instant Client referenced by the agent plugin 'mk-oracle' to escalate their privileges if an agent has this plugin enabled.
Which versions are affected by CVE-2026-105331?
How do I fix CVE-2026-105331?
No fix has been published for CVE-2026-105331 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-105331 being exploited?
There is no known exploitation of CVE-2026-105331 in the wild and no public exploit code.
Sources
Also known as GHSA-hmv5-8m9q-xc8h.