Quick answers
- Is CVE-2026-91006 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91006 being exploited in the wild.
- How severe is CVE-2026-91006?
- Informational severity, published 28 September 2026.
- Which products and versions are affected?
- Apache Karaf.
- Is there a fix for CVE-2026-91006?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-91006 attacked?
- It is attacked over the network or with local access.
- Am I affected by CVE-2026-91006?
- Check whether you run Apache Karaf. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The InstanceServiceImpl builds shell commands via string concatenation of caller-supplied javaOpts without quoting or escaping, then executes the result through /bin/sh (Unix) or cscript (Windows). Shell metacharacters (;, |, `, $(...)) in javaOpts are interpreted by the shell rather than passed to the JVM, enabling arbitrary command execution. The vulnerability is reachable via instance:create, instance:start, instance:restart, instance:change-opts shell commands and equivalent InstanceMBean JMX operations (createInstance, startInstance, changeJavaOpts, cloneInstance).
Affected products
- Apache Karaf
Timeline
- 2026-09-28: disclosed