langchain-ai langchain up to 0.3.79/1.0.6 Template String special elements used in a template engine

Summaryinfo

A vulnerability labeled as critical has been found in langchain-ai langchain up to 0.3.79/1.0.6. This affects an unknown part of the component Template String Handler. Executing a manipulation can lead to improper neutralization of special elements used in a template engine. This vulnerability is registered as CVE-2025-65106. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in langchain-ai langchain up to 0.3.79/1.0.6. This vulnerability affects an unknown part of the component Template String Handler. The manipulation with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. The CWE definition for the vulnerability is CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

LangChain is a framework for building agents and LLM-powered applications. From versions 0.3.79 and prior and 1.0.0 to 1.0.6, a template injection vulnerability exists in LangChain's prompt template system that allows attackers to access Python object internals through template syntax. This vulnerability affects applications that accept untrusted template strings (not just template variables) in ChatPromptTemplate and related prompt template classes. This issue has been patched in versions 0.3.80 and 1.0.7.

The advisory is shared for download at github.com. This vulnerability was named CVE-2025-65106 since 11/17/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1221.

Upgrading to version 0.3.80 or 1.0.7 eliminates this vulnerability. Applying the patch c4b6ba254e1a49ed91f2e268e6484011c540542a is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• langchain-ai

Name

• langchain

Version

• 0.3.0
• 0.3.1
• 0.3.2
• 0.3.3
• 0.3.4
• 0.3.5
• 0.3.6
• 0.3.7
• 0.3.8
• 0.3.9
• 0.3.10
• 0.3.11
• 0.3.12
• 0.3.13
• 0.3.14
• 0.3.15
• 0.3.16
• 0.3.17
• 0.3.18
• 0.3.19
• 0.3.20
• 0.3.21
• 0.3.22
• 0.3.23
• 0.3.24
• 0.3.25
• 0.3.26
• 0.3.27
• 0.3.28
• 0.3.29
• 0.3.30
• 0.3.31
• 0.3.32
• 0.3.33
• 0.3.34
• 0.3.35
• 0.3.36
• 0.3.37
• 0.3.38
• 0.3.39
• 0.3.40
• 0.3.41
• 0.3.42
• 0.3.43
• 0.3.44
• 0.3.45
• 0.3.46
• 0.3.47
• 0.3.48
• 0.3.49
• 0.3.50
• 0.3.51
• 0.3.52
• 0.3.53
• 0.3.54
• 0.3.55
• 0.3.56
• 0.3.57
• 0.3.58
• 0.3.59
• 0.3.60
• 0.3.61
• 0.3.62
• 0.3.63
• 0.3.64
• 0.3.65
• 0.3.66
• 0.3.67
• 0.3.68
• 0.3.69
• 0.3.70
• 0.3.71
• 0.3.72
• 0.3.73
• 0.3.74
• 0.3.75
• 0.3.76
• 0.3.77
• 0.3.78
• 0.3.79
• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6

License

• open-source

Website

• Product: https://github.com/langchain-ai/langchain/

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