PYSEC-2026-2556 LangChain: Path traversal and sandbox escape in LangChain file-search middleware and loaders

Summary 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 t...

CVE-2026-55443

CVE-2026-55443 describes a path traversal / sandbox-escape flaw in LangChain prior to 1.3.9. The vulnerability arises when components that resolve filesystem paths or expand search patterns fail to confine results to a trusted root, allowing untrusted inputs (paths, globs, symlinks, or LLM-influe...

GHSA-GR75-JV2W-4656 LangChain: Path traversal and sandbox escape in LangChain file-search middleware and loaders

Summary 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 t...

Symlink Attack

Overview langchain is a Building applications with LLMs through composability Affected versions of this package are vulnerable to Symlink Attack via the file-search middleware and loaders that resolve filesystem paths and search patterns without confining the resolved path to the intended root...