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VulnerabilityPublished Updated

CVE-2026-91006: Apache Karaf · OS Command Injection

Affects Apache KarafSource CVE Database V5

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Not known to be exploited · CVSS 8.8 High : upgrade to 4.4.12 soon.

Data as of 12 Nov 2026, 23:25 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
1.1% chance of exploitation in 30 days – higher than 66% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.4.12
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade Apache Karaf and org.apache.karaf/apache-karaf to 4.4.12.

Affected software

ProductAffectedFixed in
Apache Software FoundationApache KarafAffected
  • <4.4.12
Fixed in
  • 4.4.12
Mavenorg.apache.karaf/apache-karafpkg:maven/org.apache.karaf/apache-karafOther threatsAffected
  • <4.4.12
Fixed in
  • 4.4.12

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Mitigation involves setting karaf.secured.command.compulsory.roles=admin in etc/system.properties to close fail-open gaps, restricting which principals can access instance:* commands and InstancesMBean via role assignments in etc/users.properties, and treating javaOpts input as untrusted unless from fully trusted operators. Users should apply these configuration changes to reduce risk until an official fix is available.

Description

CVE-2026-91006 is an OS command injection vulnerability in Apache Karaf's instance-management service. The vulnerability arises because the javaOpts parameter is concatenated into a shell command without proper quoting, allowing shell metacharacters to be interpreted by the OS shell. This can lead to arbitrary command execution with the privileges of the Karaf process user. The flaw is reachable via several Karaf shell commands and JMX operations related to instance management. Mitigations include restricting access to these commands and treating javaOpts as untrusted input unless from fully trusted operators.

References

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