langchain4j up to 1.5.3-beta10/1.11.10-beta18/1.18.1-beta27 LangChain4j-agentic AgenticScopeJsonSerializationIT.java AgenticScopeSerializer.fromJson deserialization

Summaryinfo

A vulnerability categorized as problematic has been discovered in langchain4j up to 1.5.3-beta10/1.11.10-beta18/1.18.1-beta27. This issue affects the function AgenticScopeSerializer.fromJson of the file AgenticScopeJsonSerializationIT.java of the component LangChain4j-agentic. Such manipulation leads to deserialization. This vulnerability is documented as CVE-2026-97869. The attack can be executed remotely. Additionally, an exploit exists. It is advisable to upgrade the affected component. The project maintainer kindly explains: "The issue was reported to us privately on 23 July 2026 and fixed in releases published on 29 July 2026. It is tracked as GHSA-gmwr-7wmf-mrjm. Exploitation requires an application to have enabled AgenticScope persistence, which is opt-in, and an attacker who can already write to that store. All maintained release lines have been patched."

Detailsinfo

A vulnerability was found in langchain4j up to 1.5.3-beta10/1.11.10-beta18/1.18.1-beta27. It has been rated as problematic. Affected by this issue is the function AgenticScopeSerializer.fromJson of the file AgenticScopeJsonSerializationIT.java of the component LangChain4j-agentic. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-97869. The exploitation is known to be difficult. The attack may be launched remotely. The exploitation needs additional levels of successful authentication. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept. The project maintainer kindly explains: "The issue was reported to us privately on 23 July 2026 and fixed in releases published on 29 July 2026. It is tracked as GHSA-gmwr-7wmf-mrjm. Exploitation requires an application to have enabled AgenticScope persistence, which is opt-in, and an attacker who can already write to that store. All maintained release lines have been patched."

Upgrading to version 1.5.3-beta11, 1.11.10-beta19 or 1.18.1-beta28 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Name

• langchain4j

Version

• 1.5.3-beta10
• 1.11.10-beta18
• 1.18.1-beta27

Website

• Product: https://github.com/langchain4j/langchain4j/

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Accepted

• Submit #911825: langchain4j langchain4j-agentic 1.18.0 Deserialization (by afish)

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