rewindex

RewindexCVEsLangChain (LangSmith)

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

Medium · CVSS 5.1 (CVSS 3.1)EPSS 0.21%, 11th percentilePublished Updated Assigner: GitHub_M

Description

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.

Vector CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N · CWE-22, CWE-59

Tracked companies

LangChain (LangSmith)

Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

langchain-ai: langchainlangchain-ai: langchain-anthropic

References

All CVEsMarkdownJSON