{"schemaVersion":3,"id":"CVE-2026-44843","aliases":["GHSA-pjwx-r37v-7724","PYSEC-2026-2564","CGA-2rj5-xgpq-prf5","CGA-9crw-mx62-rxv6","CGA-9hw5-x5cx-79wg","CGA-c26r-r876-j463","CGA-c386-829h-9w7c","CGA-c984-4gj6-4g35","CGA-cxfq-jgj5-mxcc","CGA-g4h4-rg54-7p96","CGA-gmr5-c8q6-xm65","CGA-j4mq-w8cm-mh6h","CGA-mpmm-rhfc-j6m2","CGA-mx7w-x54r-7jqr","CGA-v6fw-qxjw-v3c7","CGA-vcg2-rc5g-xhvv","CGA-vjpj-9855-4mp9","CGA-w333-63mj-qh35","CGA-xgv2-mjqf-qjv6","CGA-xhpj-c2x7-r474"],"status":"published","duplicateOf":null,"title":null,"description":"LangChain is a framework for building agents and LLM-powered applications. Prior to 0.3.85 and 1.3.3, LangChain contains older runtime code paths that deserialize run inputs, run outputs, or other application-controlled payloads using overly broad object allowlists. These paths may call load() with allowed_objects=\"all\". This does not enable arbitrary Python object deserialization, but it does allow any trusted LangChain-serializable object to be revived, which is broader than these runtime paths require. As a result, attacker-supplied LangChain serialized constructor dictionaries may cause trusted runtime paths to instantiate classes with untrusted constructor arguments. This vulnerability is fixed in 0.3.85 and 1.3.3.","dates":{"published":"2026-05-26T19:47:35.328Z","modified":"2026-05-27T14:07:03.564Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.2,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Pypi","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","exploitability":10,"impact":7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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