CVE-2026-55443— LangChain: Path traversal and sandbox escape in LangChain file-search middleware and loaders

LangChain: Path traversal and sandbox escape in LangChain file-search middleware and loaders

LangChain is a framework for building agents and LLM-powered applications. Prior to 1.3.9, several LangChain components that resolve filesystem paths or expand search patterns do not consistently confine the resolved path to the intended root directory. Affected behaviors include: a file-search agent middleware that validates a starting directory but not the search pattern or the resolved target of matched files, so glob patterns and symlinks can reach files outside the configured root; prompt- and chain/agent-configuration loaders that accept path fields and resolve them without confining the result to a trusted base or rejecting symlink targets; and path-prefix authorization checks that compare by string prefix without a path-segment boundary, so a sibling path sharing the prefix is accepted. When these components receive path values, search patterns, or workspace contents influenced by an untrusted source — including an LLM acting on untrusted input — the result can be disclosure of files outside the intended boundary. This vulnerability is fixed in 1.3.9.

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

对路径名的限制不恰当(路径遍历)

LangChain 路径遍历漏洞

langchain-ai langchain是langchain-ai的人工智能软件开发框架。 LangChain存在安全漏洞，该漏洞源于文件系统路径解析或搜索模式扩展未将解析路径限制在目标根目录内，可能导致文件泄露。

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