{"api_version":"1","generated_at":"2026-09-30T23:54:17+00:00","cve":"CVE-2026-102509","urls":{"html":"https://cve.report/CVE-2026-102509","api":"https://cve.report/api/cve/CVE-2026-102509.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-102509","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-102509"},"summary":{"title":"Apache PLC4X, Apache PLC4X: Pre-authentication resource exhaustion in the OPC UA driver and the Java SPI parser","description":"Memory Allocation with Excessive Size Value, Allocation of Resources Without Limits, and Uncontrolled Recursion in the Java implementation of Apache PLC4X (PLC4J) allow a malicious or impersonated device to exhaust the memory or stack of the client application, causing a denial of service.\n\nIn the OPC UA driver these defects are reachable before authentication: the offending data is parsed while the secure channel and session are being established, before the server's identity has been bound to it. Configuring a trusted server therefore does not prevent exploitation by an attacker who can \nimpersonate it.\n\nThe individual defects are:\n- Length-prefixed byte strings are allocated at the size claimed on the wire before the length is checked against the data actually received (0.10.0 through 0.13.1).\n- Array fields in generated protocol parsers pre-allocate a list with the element count claimed on the wire, allowing a single count field to trigger a multi-gigabyte allocation. This parser is shared by all PLC4J drivers; the OPC UA driver is the verified pre-authentication path (0.10.0 through 0.13.1).\n- The OPC UA driver accumulates message chunks without enforcing the negotiated maximum chunk count and message size (0.12.0 through 0.13.1).\n- The OPC UA driver pre-allocates collections using element counts received from the server (0.10.0 through 0.13.1).\n- Recursive protocol types are parsed without a nesting-depth limit. The same defect in the Go implementation is covered by  CVE-2026-102510 https://cveprocess.apache.org/cve5/CVE-2026-102510 .\n\nThis issue affects Apache PLC4X: from 0.10.0 before 1.0.0.\n\nUsers are recommended to upgrade to version 1.0.0, which fixes the issue.","state":"PUBLISHED","assigner":"apache","published_at":"2026-09-30 09:17:14","updated_at":"2026-09-30 16:14:10"},"problem_types":["CWE-674","CWE-770","CWE-789","CWE-789 CWE-789 Memory Allocation with Excessive Size Value. This covers the byte strings (F2), the array counts (F4) and the element counts (f024).","CWE-770 CWE-770 Allocation of Resources Without Limits or Throttling. This covers the chunk accumulation (F3).","CWE-674 CWE-674 Uncontrolled Recursion. 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Agarwal"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<div><pre>Memory Allocation with Excessive Size Value, Allocation of Resources Without Limits, and Uncontrolled Recursion in the Java implementation of Apache PLC4X (PLC4J) allow a malicious or impersonated device to exhaust the memory or stack of the client application, causing a denial of service.<br><br>In the OPC UA driver these defects are reachable before authentication: the offending data is parsed while the secure channel and session are being established, before the server's identity has been bound to it. Configuring a trusted server therefore does not prevent exploitation by an attacker who can <br>impersonate it.<br><br>The individual defects are:<br>- Length-prefixed byte strings are allocated at the size claimed on the wire before the length is checked against the data actually received (0.10.0 through 0.13.1).<br>- Array fields in generated protocol parsers pre-allocate a list with the element count claimed on the wire, allowing a single count field to trigger a multi-gigabyte allocation. This parser is shared by all PLC4J drivers; the OPC UA driver is the verified pre-authentication path (0.10.0 through 0.13.1).<br>- The OPC UA driver accumulates message chunks without enforcing the negotiated maximum chunk count and message size (0.12.0 through 0.13.1).<br>- The OPC UA driver pre-allocates collections using element counts received from the server (0.10.0 through 0.13.1).<br>- Recursive protocol types are parsed without a nesting-depth limit. The same defect in the Go implementation is covered by <a href=\"https://cveprocess.apache.org/cve5/CVE-2026-102510\">CVE-2026-102510</a>.<br><br>This issue affects Apache PLC4X: from 0.10.0 before 1.0.0.<br><br>Users are recommended to upgrade to version 1.0.0, which fixes the issue.</pre></div>"}],"value":"Memory Allocation with Excessive Size Value, Allocation of Resources Without Limits, and Uncontrolled Recursion in the Java implementation of Apache PLC4X (PLC4J) allow a malicious or impersonated device to exhaust the memory or stack of the client application, causing a denial of service.\n\nIn the OPC UA driver these defects are reachable before authentication: the offending data is parsed while the secure channel and session are being established, before the server's identity has been bound to it. Configuring a trusted server therefore does not prevent exploitation by an attacker who can \nimpersonate it.\n\nThe individual defects are:\n- Length-prefixed byte strings are allocated at the size claimed on the wire before the length is checked against the data actually received (0.10.0 through 0.13.1).\n- Array fields in generated protocol parsers pre-allocate a list with the element count claimed on the wire, allowing a single count field to trigger a multi-gigabyte allocation. This parser is shared by all PLC4J drivers; the OPC UA driver is the verified pre-authentication path (0.10.0 through 0.13.1).\n- The OPC UA driver accumulates message chunks without enforcing the negotiated maximum chunk count and message size (0.12.0 through 0.13.1).\n- The OPC UA driver pre-allocates collections using element counts received from the server (0.10.0 through 0.13.1).\n- Recursive protocol types are parsed without a nesting-depth limit. 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