Deserialization Flaw in LangChain4j Agentic Component Impacting Multiple Releases
CVE-2026-97869

2.1LOW

Key Information:

Vendor

LangChain4j

Status
Langchain4j
Vendor
CVE Published:
25 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-97869?

A deserialization flaw in the LangChain4j-agentic component impacts multiple pre-release versions, allowing remote exploitation if AgenticScope persistence is enabled. This issue was identified in the AgenticScopeSerializer.fromJson method and poses a risk where an attacker with write access to the persistence store could trigger arbitrary code execution. Users are recommended to upgrade to the latest patched versions to mitigate potential exploitation risks.

Affected Version(s)

langchain4j 1.5.3-beta10

langchain4j 1.11.10-beta18

langchain4j 1.18.1-beta27

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-97869 - Proof of Concept

References

https://vuldb.com/vuln/409886
vdb-entrytechnical-description
https://vuldb.com/vuln/409886/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-97869
third-party-advisory

CVSS V4

Score:
2.1
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

afish (VulDB User)
VulDB CNA Team
.