CVE-2025-68665Public exploitNetwork attack vector

Secret extraction via unescaped lc-keyed objects

Published Dec 23, 2025 · Updated Dec 23, 2025

Serialization injection in LangChain.js allows remote attackers controlling serialized data to read environment-variable secrets. Serializable.toJSON() leaves lc-keyed objects unescaped in free-form kwargs, so load() later interprets attacker data as internal serialized objects. Secret extraction requires secretsFromEnv; constructor injection is limited to classes present in configured import maps.

CVSS severity8.6
High
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Serialization injection in LangChain.js allows remote attackers controlling serialized data to read environment-variable secrets. Serializable.toJSON() leaves lc-keyed objects unescaped in free-form kwargs, so load() later interprets attacker data as internal serialized objects. Secret extraction requires secretsFromEnv; constructor injection is limited to classes present in configured import maps.

The record

CVE
CVE-2025-68665
Published
Dec 23, 2025
Updated
Dec 23, 2025
Vendor
LangChain
Product
LangChain.js
Classifications
CWE-502, T1552
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=langchain < 0.3.37
  2. Affected versionversion=langchain >= 1.0.0, < 1.2.3
  3. Affected versionversion=@langchain/core < 0.3.80
  4. Affected versionversion=@langchain/core >= 1.0.0, < 1.1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LangChain · LangChain.jsversion=langchain < 0.3.37; version=langchain >= 1.0.0, < 1.2.3; version=@langchain/core < 0.3.80; version=@langchain/core >= 1.0.0, < 1.1.8

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
8.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1552Unsecured Credentials

Public exploit references

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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