{"schema":"threatline.record/2","record":{"id":"CVE-2026-102509","aliases":[],"summary":"Apache PLC4X, Apache PLC4X: Pre-authentication resource exhaustion in the OPC UA driver and the Java SPI parser","details":"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.","categories":["Unclassified"],"product":"Apache PLC4X","vendor":"Apache Software Foundation","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-102509","source_modified_at":"2026-09-30T14:40:06.881Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Apache PLC4X","vendor":"Apache Software Foundation","versions":[{"status":"affected","version":"0.10.0","lessThan":"1.0.0","versionType":"semver"},{"status":"unaffected","version":"1.0.0","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-102509","source_modified_at":"2026-09-30T14:40:06.881Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Apache PLC4X","vendor":"Apache Software Foundation","versions":[{"status":"affected","version":"0.10.0","lessThan":"1.0.0","versionType":"semver"},{"status":"unaffected","version":"1.0.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-102509","source_modified_at":"2026-09-30T14:40:06.881Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Apache PLC4X","ecosystem":null},"version":"1.0.0","basis":"first unaffected version stated in the CVE record"}],"cvss":8.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00401,"percentile":0.33192,"score_date":"2026-10-23"},"published_at":"2026-09-30T08:00:27.709Z","modified_at":"2026-09-30T14:40:06.881Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-102509","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T14:40:06.881Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-102509","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://lists.apache.org/thread.html/qngc85qhnlj7kpk3z58z0xlxhz2tn6gp","tags":["vendor-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-09-30T14:39:55.913450Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-30T14:40:06.881Z","content_hash":"c5f06af0031962da46f69045a5878b5792bef747bc92773245f8fc136220a84f"}}