{"id":"CVE-2026-44843","state":"PUBLISHED","title":"LangChain: Unsafe deserialization of attacker-controlled LangChain objects through overly broad `load()` allowlists","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.","publishedAt":"2026-05-26T19:47:35.328Z","updatedAt":"2026-05-27T14:07:03.564Z","severity":{"score":8.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["langchain-ai langchain"],"affected":[{"vendor":"langchain-ai","product":"langchain","versions":[{"version":"< 0.3.85","status":"affected"},{"version":">= 1.0.0a1, < 1.3.3","status":"affected"}]}],"references":["https://github.com/langchain-ai/langchain/security/advisories/GHSA-pjwx-r37v-7724"],"weaknesses":["CWE-502"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/44xxx/CVE-2026-44843.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-44843","state":"PUBLISHED","datePublished":"2026-05-26T19:47:35.328Z","dateUpdated":"2026-05-27T14:07:03.564Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-07T21:21:48.352Z"},"containers":{"cna":{"title":"LangChain: Unsafe deserialization of attacker-controlled LangChain objects through overly broad `load()` allowlists","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"langchain-ai","product":"langchain","versions":[{"version":"< 0.3.85","status":"affected"},{"version":">= 1.0.0a1, < 1.3.3","status":"affected"}]}],"references":[{"url":"https://github.com/langchain-ai/langchain/security/advisories/GHSA-pjwx-r37v-7724","name":"https://github.com/langchain-ai/langchain/security/advisories/GHSA-pjwx-r37v-7724","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-502","lang":"en","description":"CWE-502: Deserialization of Untrusted Data","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-26T19:47:35.328Z"},"source":{"advisory":"GHSA-pjwx-r37v-7724","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-27T14:06:50.805026Z","id":"CVE-2026-44843","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-27T14:07:03.564Z"}}]}}}