CVE-2025-68664-LangGrinch-PoC

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langgrinch-cve-2025-68664-analysis

LangGrinch Vulnerability Analysis: CVE-2025-68664 Overview This repository contains a technical report analyzing CVE-2025-68664, also known as LangGrinch, a serialization injection vulnerability affecting LangChain Core. The report explains the vulnerability background, root cause, exploitation...

LangChain-Core < 0.3.81 / 1.x < 1.2.5

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...

GHSA-3PX3-54CX-RMW9 xmldom: Creation-time XML Name/QName validation is bypassable via an embedded line terminator, allowing injection on the default serialization path

Summary An embedded line terminator bypasses xmldom's always-on, WHATWG-mandated creation-time name validation. createElementNS, createAttributeNS, createDocumentType, and createAttribute should reject a malformed qualified name with InvalidCharacterError, but a name whose first line is well-form...

CVE-2026-83609 xmldom: Creation-time XML Name/QName validation is bypassable via an embedded line terminator, allowing injection on the default serialization path

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. From 0.9.0 until 0.9.12, the shared reg builder in lib/grammar.js compiles the anchored QNameexact validator with the multiline flag, so ^ and $ validate only one line instead of the complete...

PYSEC-2026-373 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-2026-53461

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...

CVE-2026-47759

TinyMCE is an open source rich text editor. Prior to 5.11.1, 7.9.3, and 8.5.1, there is a stored XSS vulnerability via unsanitized data-mce- attributes data-mce-href, data-mce-src, data-mce-style. Allows attackers to inject malicious values that override safe attributes during serialization,...

GHSA-4P64-V8F5-R2GX Multiple security fixes in justhtml

Summary justhtml 1.16.0 fixes multiple security issues in sanitization, serialization, and programmatic DOM handling. Most of these issues affected one of these advanced paths rather than ordinary parsed HTML with the default safe settings: - programmatic DOM input to sanitize or sanitizedom -...

PT-2026-29497

Name of the Vulnerable Software and Affected Versions xmldom versions 0.6.0 and prior, and @xmldom/xmldom prior to versions 0.8.12 and 0.9.9 Description The xmldom library contains a flaw where attacker-controlled strings including the CDATA terminator can be inserted into a CDATASection node...

Case study: Securing AI application supply chains

The rapid adoption of AI applications, including agents, orchestrators, and autonomous workflows, represents a significant shift in how software systems are built and operated. Unlike traditional applications, these systems are active participants in execution. They make decisions, invoke tools,...

Case study: Securing AI application supply chains

The rapid adoption of AI applications, including agents, orchestrators, and autonomous workflows, represents a significant shift in how software systems are built and operated. Unlike traditional applications, these systems are active participants in execution. They make decisions, invoke tools,...

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-2025-68665

A flaw was found in LangChain. A remote attacker could exploit a serialization injection vulnerability in the toJSON method. This occurs because the method fails to properly escape objects containing 'lc' keys during serialization of free-form data. When user-controlled data includes this key...

CVE-2025-68664

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-2025-68665 LangChain serialization injection vulnerability enables secret extraction

LangChain is a framework for building LLM-powered applications. Prior to @langchain/core versions 0.3.80 and 1.1.8, and prior to langchain versions 0.3.37 and 1.2.3, a serialization injection vulnerability exists in LangChain JS's toJSON method and subsequently when string-ifying objects using...

CVE-2025-68665 LangChain serialization injection vulnerability enables secret extraction

LangChain is a framework for building LLM-powered applications. Prior to @langchain/core versions 0.3.80 and 1.1.8, and prior to langchain versions 0.3.37 and 1.2.3, a serialization injection vulnerability exists in LangChain JS's toJSON method and subsequently when string-ifying objects using...

CVE-2025-68665

CVE-2025-68665 (LangChain JS) has a serialization-injection vulnerability in LangChain JS toJSON() and JSON.stringify() paths that fails to escape objects with the internal 'lc' key, causing user-controlled data to be mistaken for LangChain objects during deserialization. Affected: LangChain JS b...

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-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...