high7.5
CVE-2026-34070
LangChain Core has Path Traversal vulnerabilites in legacy `load_prompt` functions
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | langchain-core | < 1.2.22 | 1.2.22 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Langchain | Langchain Core | before 1.2.22 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-qh6h-p6c9-ff54
- https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54
- https://github.com/langchain-ai/langchain/commit/27add913474e01e33bededf4096151130ba0d47c
- https://github.com/langchain-ai/langchain/releases/tag/langchain-core==1.2.22
- https://nvd.nist.gov/vuln/detail/CVE-2026-34070
- https://access.redhat.com/errata/RHSA-2026:24766
- https://access.redhat.com/errata/RHSA-2026:37275
- https://access.redhat.com/errata/RHSA-2026:59159
- https://access.redhat.com/security/cve/CVE-2026-34070
- https://bugzilla.redhat.com/show_bug.cgi?id=2453287
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34070.json