Security Bulletin: LangChain Serialization Injection Vulnerability in dumps()/dumpd() (Fixed in 0.3.81 / 1.2.5) affects watsonx.data

Summary A serialization injection vulnerability in LangChain's dumps and dumpd functions pre-0.3.81 / 1.2.5 allows user-controlled data with 'lc' keys to be deserialized as objects. This issue is fixed in versions 0.3.81 and 1.2.5. This can affect watsonx.data. Vulnerability Details...

Integer Overflow or Wraparound

Overview ujson is an Ultra fast JSON encoder and decoder for Python Affected versions of this package are vulnerable to Integer Overflow or Wraparound via the indent parameter in the dumps, dump, or encode functions. An attacker can cause a crash or infinite loop by supplying large or negative...

orjson does not limit recursion for deeply nested JSON documents

The orjson.dumps function in orjson before 3.11.6 does not limit recursion for deeply nested JSON documents...

CVE-2025-67221

The orjson.dumps function in orjson thru 3.11.4 does not limit recursion for deeply nested JSON documents...

Uncontrolled Recursion

Overview Affected versions of this package are vulnerable to Uncontrolled Recursion in the dumps function in formatter.rs. An attacker can cause a core dump by supplying a deeply nested JSON document. PoC python import orjson import sys import platform printf'OS: platform.platform' printf'Python...

PT-2026-3955

Name of the Vulnerable Software and Affected Versions orjson versions through 3.11.4 Description The orjson.dumps function does not limit recursion when processing deeply nested JSON documents. This can lead to a denial of service. Recommendations Update to a version of orjson newer than 3.11.4...

Critical LangChain Core Vulnerability Exposes Secrets via Serialization Injection

A critical security flaw has been disclosed in LangChain Core that could be exploited by an attacker to steal sensitive secrets and even influence large language model LLM responses through prompt injection. LangChain Core i.e., langchain-core is a core Python package that's part of the LangChain...

CVE-2025-68664

A flaw was found in LangChain, a framework for building agents and LLM-powered applications. A remote attacker can exploit a serialization injection vulnerability in LangChain's dumps and dumpd functions. This occurs because the functions do not properly escape dictionaries containing the interna...

CVE-2025-68664 LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs

LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps and dumpd functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries...

CVE-2025-68664 LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs

LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps and dumpd functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries...

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...

GHSA-C67J-W6G6-Q2CM LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs

Summary A serialization injection vulnerability exists in LangChain's dumps and dumpd functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data...

PT-2025-52859

Name of the Vulnerable Software and Affected Versions: LangChain versions prior to 0.3.81 and 1.2.5 Description: A serialization injection vulnerability exists in LangChain's dumps and dumpd functions. These functions do not properly escape dictionaries containing 'lc' keys when serializing data...