LangChain is a framework for building agents and LLM-powered applications. Prior to version 1.2.22, multiple functions in langchain_core.prompts.loading read files from paths embedded in deserialized config dicts without validating against directory traversal or absolute path injection. When an application passes user-influenced prompt configurations to load_prompt() or load_prompt_from_config(), an attacker can read arbitrary files on the host filesystem, constrained only by file-extension checks (.txt for templates, .json/.yaml for examples). This issue has been patched in version 1.2.22.
Affected: PyPI: langchain-core
## Summary
Multiple functions in `langchain_core.prompts.loading` read files from paths embedded in deserialized config dicts without validating against directory traversal or absolute path injection. When an application passes user-influenced prompt configurations to `load_prompt()` or `load_prompt_from_config()`, an attacker can read arbitrary files on the host filesystem, constrained only by file-extension checks (`.txt` for templates, `.json`/`.yaml` for examples).
**Note:** The affected functions (`load_prompt`, `load_prompt_from_config`, and the `.save()` method on prompt classes) are undocumented legacy APIs. They are superseded by the `dumpd`/`dumps`/`load`/`loads` serialization APIs in `langchain_core.load`, which do not perform filesystem reads and use an allowlist-based security model. As part of this fix, the legacy APIs have been formally deprecated and will be removed in 2.0.0.
## Affected component
**Package:** `langchain-core` **File:** `langchain_core/prompts/loading.py` **Affected functions:** `_load_template()`, `_load_examples()`, `_load_few_shot_prompt()`
## Severity
**High**
The score reflects the file-extension constraints that limit which files can be read.
## Vulnerable code paths
| Config key | Loaded by | Readable extensions | |---|---|---| | `template_path`, `suffix_path`, `prefix_path` | `_load_template()` | `.txt` | | `examples` (when string) | `_load_examples()` | `.json`, `.yaml`, `.yml` | | `example_prompt_path` | `_load_few_shot_pr…
Affected: PyPI: langchain-core
LangChain is a framework for building agents and LLM-powered applications. Prior to version 1.2.22, multiple functions in langchain_core.prompts.loading read files from paths embedded in deserialized config dicts without validating against directory traversal or absolute path injection. When an application passes user-influenced prompt configurations to load_prompt() or load_prompt_from_config(), an attacker can read arbitrary files on the host filesystem, constrained only by file-extension checks (.txt for templates, .json/.yaml for examples). This issue has been patched in version 1.2.22.
axios: Axios: Server-Side Request Forgery and proxy bypass due to improper hostname normalization fast-uri: fast-uri: Path traversal vulnerability allows bypass of security policies langchain: path traversal in legacy load_prompt functions in langchain-core follow-redirects: follow-redirects: Information disclosure via cross-domain redirects
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in LangChain ausnutzen, um Informationen offenzulegen.