{"cve":"CVE-2026-43825","nvd":{"published":"2026-07-06T17:16:31.570","modified":"2026-10-25T20:10:00.147","status":"Analyzed","description":"Untrusted Java Deserialization in Apache OpenNLP SvmDoccatModel\n\nVersions Affected:\n  before 3.0.0-M4 (libsvm document categorization module; introduced in\n  OPENNLP-1808 and only present on the 3.x line)\n\nDescription:\nSvmDoccatModel.deserialize(InputStream) reads an attacker-controlled\nstream with java.io.ObjectInputStream and calls readObject() without an\nObjectInputFilter installed. ObjectInputStream materialises every class\nreferenced in the stream before the resulting object is cast to\nSvmDoccatModel, so the cast that follows readObject() executes only\nafter the foreign object graph has already been deserialised in full.\n\nIf a Java deserialization gadget chain is available on the consumer's\nclasspath, a crafted payload supplied to\ndeserialize() executes arbitrary code in the JVM that loads it. Apache\nOpenNLP itself does not ship a known gadget chain, so the realistic\nrisk is to downstream applications that embed the libsvm module\nalongside vulnerable transitive dependencies. The method is public and\nstatic, so any caller can pass an untrusted stream to it directly.\n\nThe practical impact is remote code execution against processes that\nload SvmDoccatModel instances from untrusted or semi-trusted origins.\n\nMitigation:\n\n3.x users should upgrade to 3.0.0-M4.\n\nUsers who cannot upgrade immediately should treat all serialized\nSvmDoccatModel streams as untrusted input unless their provenance is\nverified, and should avoid invoking SvmDoccatModel.deserialize() on\nstreams supplied by end users or fetched from third-party sources\nwithout integrity checks.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","score":7.3},"cwes":["CWE-502"],"references":["https://lists.apache.org/thread/c7kom0pgk9cbpfnbooh5m3g85ndf50hn","http://www.openwall.com/lists/oss-security/2026/07/06/9"],"products":["apache:opennlp"],"source":"nvd","synced_at":"2026-10-25T23:44:34.550481224+00:00"},"epss":{"cve":"CVE-2026-43825","score":0.13921,"percentile":0.96513,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}