CVE-2026-34070

CVE-2026-34070 affects LangChain Core prior to 1.2.22, where multiple functions in langchain_core.prompts.loading read files from paths embedded in deserialized config dicts without validating against directory traversal or absolute path injections. An attacker could read arbitrary host files whe...

CVE-2025-68664

CVE-2025-68664 (LangGrinch) is a serialization-injection vulnerability in the LangChain Core Python package. Affected versions prior to 0.3.81 and 1.2.5 fail to escape dictionaries containing the internal lc marker during dumps/dumpd, causing user-controlled data to be treated as legitimate LangC...

CVE-2026-40087

LangChain CVE-2026-40087 affects the f-string prompt-template validation prior to versions 0.3.84 and 1.2.28. The vulnerability arises because DictPromptTemplate and ImagePromptTemplate could accept templates containing attribute access or indexing expressions and evaluate them during formatting,...

CVE-2026-26013

The CVE affects LangChain’s ChatOpenAI component, where get_num_tokens_from_messages() can fetch arbitrary image_url values without validation when counting tokens for vision-enabled models, enabling SSRF by user-provided URLs. Root cause: insufficient validation of image_url during token countin...