CVE-2026-97869: langchain4j deserialization flaw in AgenticScopeSerializer.fromJson

Summary

A flaw in the AgenticScopeSerializer.fromJson function of LangChain4j-agentic, in langchain4j versions up to 1.5.3-beta10, 1.11.10-beta18 and 1.18.1-beta27, allows deserialization manipulation that can be exploited remotely, though the attack complexity is rated high. The exploit has been published, and the maintainer says exploitation requires AgenticScope persistence to be enabled and an attacker who can already write to that store.

Mitigation

Upgrade to version 1.5.3-beta11, 1.11.10-beta19 or 1.18.1-beta28. The maintainer states that all maintained release lines have been patched, and the issue is tracked as GHSA-gmwr-7wmf-mrjm.

Related items

• HighCVE-2026-123818: LMDeploy is a toolkit for compressing, deploying, and serving large language models. From 0.12.3 until 0.15.0…Similar attack · NVD/CVE Database
• HighGHSA-vvr2-h2jp-838m: Code Graph RAG: MCP paginated read_file path traversal / arbitrary file readSimilar attack · GitHub Advisory Database
• MediumAttackers Crash Claude's 'Office Party' Flaw to Run Malicious Code on LinuxSimilar attack · Dark Reading
• MediumCVE-2026-124588: huggingface finetrainers code injection via Library argumentSimilar attack · NVD/CVE Database
• MediumTaiwan-Based Hacker Used BOSSAI AI Agents to Steal Taipei Emergency Dispatch RecordsSimilar attack · The Hacker News