CVE-2026-48121Public exploit

Cross-tenant checkpoint disclosure via MongoDB operator injection

Published Aug 4, 2026 · Updated Aug 4, 2026

NoSQL injection in LangChain LangGraph.js before 1.3.1 allows attackers to read cross-tenant checkpoint data through crafted identifiers. MongoDBSaver.getTuple() passes thread_id, checkpoint_ns, and checkpoint_id objects into find() filters without enforcing string types. Exposure requires a consuming application to forward attacker-controlled configuration into the saver; operator objects can bypass thread scoping and expose checkpoint state, metadata, and pending writes.

CVSS severity6.7
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NoSQL injection in LangChain LangGraph.js before 1.3.1 allows attackers to read cross-tenant checkpoint data through crafted identifiers. MongoDBSaver.getTuple() passes thread_id, checkpoint_ns, and checkpoint_id objects into find() filters without enforcing string types. Exposure requires a consuming application to forward attacker-controlled configuration into the saver; operator objects can bypass thread scoping and expose checkpoint state, metadata, and pending writes.

The record

CVE
CVE-2026-48121
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
LangChain
Product
LangGraph.js
Classifications
CWE-943
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=< 1.3.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

LangChain · LangGraph.jsversion=< 1.3.1

Published CVSS scores

6.7GitHub Advisory DatabaseCVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/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.

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No observations available

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

Weakness, pattern, technique

CWE-943Improper Neutralization of Special Elements in Data Query Logic

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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