CVE-2026-97869Network attack vector

Unapproved type instantiation via persisted scope JSON

Published Sep 25, 2026 · Updated Sep 25, 2026

Unsafe deserialization in LangChain4j Agentic allows attackers to instantiate unapproved Java types from persisted AgenticScope JSON. AgenticScopeSerializer.fromJson enables Jackson default typing without restricting supplied type identifiers to approved classes. The flaw is reachable only when persistence is enabled and attackers can write the backing store; the instantiated class determines the resulting effect.

CVSS severityUnavailable
Unscored
EPSS probability0.38%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in LangChain4j Agentic allows attackers to instantiate unapproved Java types from persisted AgenticScope JSON. AgenticScopeSerializer.fromJson enables Jackson default typing without restricting supplied type identifiers to approved classes. The flaw is reachable only when persistence is enabled and attackers can write the backing store; the instantiated class determines the resulting effect.

The record

CVE
CVE-2026-97869
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
LangChain4j
Product
LangChain4j Agentic
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.11.10-beta18
  2. Affected versionversion=1.18.1-beta27
  3. Affected versionversion=1.5.3-beta10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

LangChain4j · LangChain4j Agenticversion=1.11.10-beta18; version=1.18.1-beta27; version=1.5.3-beta10

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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