FKIE_CVE-2026-91006

Vulnerability from fkie_nvd - Published: 2026-09-28 11:16 - Updated: 2026-09-29 04:18
Severity
Summary
Apache Karaf's instance-management service (InstanceServiceImpl) builds the command line used to launch a child Karaf JVM by string concatenation, then executes it through /bin/sh (Unix) or cscript (Windows). The caller-supplied javaOpts value is spliced into that string unquoted. A javaOpts value containing shell metacharacters (;, |, `, $(...)) is interpreted by the shell instead of being passed to the JVM as an option, giving arbitrary OS command execution as the Karaf process user. Reachable via the shell commands instance:create, instance:start, instance:restart, instance:change-opts, and the equivalent InstanceMBean JMX operations (createInstance, startInstance, changeJavaOpts, cloneInstance). Mitigation  * Set karaf.secured.command.compulsory.roles=admin in etc/system.properties to close the fail-open gap for all unconfigured command scopes. * Restrict which principals can reach instance:* commands and InstancesMBean via etc/users.properties role assignments. * Treat javaOpts passed to instance:create/instance:start/instance:change-opts/InstancesMBean as untrusted input only from fully-trusted operators.
References
security@apache.orghttps://lists.apache.org/thread/olzy0yjw82b20w59vonfjr1x7v5yzocr
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/09/28/3
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageName": "org.apache.karaf:org.apache.karaf.instance.core",
          "product": "Apache Karaf",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "4.4.12",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@apache.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Apache Karaf\u0027s instance-management service (InstanceServiceImpl) builds the command line used to launch a child Karaf JVM by string concatenation, then executes it through\u00a0/bin/sh\u00a0(Unix) or\u00a0cscript\u00a0(Windows). The caller-supplied\u00a0javaOpts\u00a0value is spliced into that string unquoted. A javaOpts value containing shell metacharacters (;,\u00a0|,\u00a0`,\u00a0$(...)) is interpreted by the shell instead of being passed to the JVM as an option, giving arbitrary OS command execution as the Karaf process user.\n\n\nReachable via the shell commands\u00a0instance:create,\u00a0instance:start,\u00a0instance:restart,\u00a0instance:change-opts, and the equivalent\u00a0InstanceMBean\u00a0JMX operations (createInstance,\u00a0startInstance,\u00a0changeJavaOpts,\u00a0cloneInstance).\n\nMitigation\u00a0  *  Set\u00a0karaf.secured.command.compulsory.roles=admin\u00a0in\u00a0etc/system.properties\u00a0to close the fail-open gap for all unconfigured command scopes.\n  *  Restrict which principals can reach\u00a0instance:*\u00a0commands and\u00a0InstancesMBean\u00a0via\u00a0etc/users.properties\u00a0role assignments.\n  *  Treat\u00a0javaOpts\u00a0passed to instance:create/instance:start/instance:change-opts/InstancesMBean\u00a0as untrusted input only from fully-trusted operators."
    }
  ],
  "id": "CVE-2026-91006",
  "lastModified": "2026-09-29T04:18:02.030",
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-91006",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-28T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-28T11:16:48.200",
  "references": [
    {
      "source": "security@apache.org",
      "url": "https://lists.apache.org/thread/olzy0yjw82b20w59vonfjr1x7v5yzocr"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/28/3"
    }
  ],
  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "security@apache.org",
      "type": "Secondary"
    }
  ]
}



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