{"id":"CVE-2026-106119","title":"LangChain is a framework for building LLM-powered applications","summary":"LangChain is a framework for building LLM-powered applications. Prior to 1.3.1, MongoDBChatMessageHistory does not enforce the documented string type for an untrusted structured session identifier at runtime, allowing the identifier to b…","severity":"medium","cvss":6,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","cwe":["CWE-943"],"vendor":"langchain-ai","product":"langchainjs","affected":["langchainjs < 1.5.14","mongodb < 1.3.1"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T20:17:17.820","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106119","references":[{"url":"https://github.com/langchain-ai/langchainjs/commit/946e3d856ff1f8ce7f7b9374c83f680a6ada79af","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchainjs/pull/11672","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchainjs/releases/tag/@langchain/mongodb@1.3.1","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-m6rx-h84q-8r95","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-06T19:45:00.727020Z"},"cvssSource":"cna","ingestedAt":"2026-10-06T19:13:33.945Z","slug":"CVE-2026-106119","body":"## Overview\n\nLangChain is a framework for building LLM-powered applications. Prior to 1.3.1, MongoDBChatMessageHistory does not enforce the documented string type for an untrusted structured session identifier at runtime, allowing the identifier to be interpreted as a MongoDB query condition rather than as a literal value when multiple users' histories are stored in a shared MongoDB collection. An attacker able to invoke chat-history operations can read, modify, or delete another user's stored conversation. Applications using authenticated, server-controlled string identifiers are not affected. This issue is fixed in version 1.3.1.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":33,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}