{"cve":"CVE-2026-44843","nvd":{"published":"2026-05-26T21:16:39.003","modified":"2026-07-24T11:10:00.170","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2},"cwes":["CWE-502"],"references":["https://github.com/langchain-ai/langchain/security/advisories/GHSA-pjwx-r37v-7724"],"products":["langchain:langchain"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-44843","score":0.00406,"percentile":0.34893,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-pjwx-r37v-7724","url":"https://osv.dev/vulnerability/GHSA-pjwx-r37v-7724","summary":"LangChain vulnerable to unsafe deserialization of attacker-controlled objects through overly broad `load()` allowlists","modified":"2026-09-10T03:51:06.718716596Z","packages":[{"ecosystem":"PyPI","name":"langchain-core","purl":"pkg:pypi/langchain-core","ranges":[">=1.0.0 <1.3.3"],"fixed":["1.3.3"]},{"ecosystem":"PyPI","name":"langchain-core","purl":"pkg:pypi/langchain-core","ranges":["<0.3.85"],"fixed":["0.3.85"]}]},{"id":"PYSEC-2026-2564","url":"https://osv.dev/vulnerability/PYSEC-2026-2564","summary":"LangChain vulnerable to unsafe deserialization of attacker-controlled objects through overly broad `load()` allowlists","modified":"2026-07-13T16:31:48.854154388Z","packages":[{"ecosystem":"PyPI","name":"langchain-core","purl":"pkg:pypi/langchain-core","ranges":["<0.3.85",">=1.0.0 <1.3.3"],"fixed":["0.3.85","1.3.3"]}]}],"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."]}