Vulnerability-Lookup

CVE-2026-106119 (GCVE-0-2026-106119)

Vulnerability from cvelistv5 – Published: 2026-10-06 18:01 – Updated: 2026-10-06 19:45

Title

LangChain: MongoDBChatMessageHistory query injection can allow cross-session access

Summary

LangChain is a framework for building LLM-powered applications. Prior to 1.3.1, MongoDBChatMessageHistory does not enforce the documented string type for an untrusted structured session identifier at runtime, allowing the identifier to be interpreted as a MongoDB query condition rather than as a literal value when multiple users' histories are stored in a shared MongoDB collection. An attacker able to invoke chat-history operations can read, modify, or delete another user's stored conversation. Applications using authenticated, server-controlled string identifiers are not affected. This issue is fixed in version 1.3.1.

Severity

6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-06 19:45 UTC

CWE

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

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7658 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/langchain-ai/langchainjs/secur…	x_refsource_CONFIRM
https://github.com/langchain-ai/langchainjs/pull/11672	x_refsource_MISC
https://github.com/langchain-ai/langchainjs/commi…	x_refsource_MISC
https://github.com/langchain-ai/langchainjs/relea…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
langchain-ai	langchainjs	Affected: < 1.5.14	guessed
@langchain	mongodb	Affected: < 1.3.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-106119

Vulnerability from fkie_nvd - Published: 2026-10-06 19:17 - Updated: 2026-10-06 20:17

Severity

6.0 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/langchain-ai/langchainjs/commit/946e3d856ff1f8ce7f7b9374c83f680a6ada79af
	security-advisories@github.com	https://github.com/langchain-ai/langchainjs/pull/11672
	security-advisories@github.com	https://github.com/langchain-ai/langchainjs/releases/tag/@langchain/mongodb@1.3.1
	security-advisories@github.com	https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-m6rx-h84q-8r95

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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        {
          "lang": "en",
          "value": "CWE-943"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-M6RX-H84Q-8R95

Vulnerability from github – Published: 2026-10-08 17:52 – Updated: 2026-10-08 17:52

Summary

LangChain: MongoDBChatMessageHistory query injection can allow cross-session access

Details

Impact

MongoDBChatMessageHistory did not enforce the documented string type for session identifiers at runtime. In affected applications, a structured session identifier could be interpreted as a MongoDB query condition rather than as a literal identifier.

Applications are affected when they pass untrusted session identifier input to MongoDBChatMessageHistory and store multiple users’ histories in the same collection. An attacker who can invoke chat-history operations may be able to read, modify, or delete another user’s stored conversation.

Applications that derive the session identifier from an authenticated, server-controlled value and enforce its type are not affected by this path.

Patches

The issue is fixed in @langchain/mongodb version 1.3.1.

Users of affected versions should upgrade to version 1.3.1 or later. The patched version validates session identifiers at runtime and ensures they are compared as literal values in MongoDB queries.

Workarounds

If an immediate upgrade is not possible, applications must reject session identifiers that are not non-empty strings. Session identifiers should be derived from an authenticated, server-controlled value and must not be passed directly from an untrusted request field.

Upgrading remains the recommended remediation.

Severity

6.0 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.3.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@langchain/mongodb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-106119"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-943"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-08T17:52:22Z",
    "nvd_published_at": "2026-10-06T19:17:42Z",
    "severity": "MODERATE"
  },
  "details": "## Impact\n\n`MongoDBChatMessageHistory` did not enforce the documented string type for session identifiers at runtime. In affected applications, a structured session identifier could be interpreted as a MongoDB query condition rather than as a literal identifier.\n\nApplications are affected when they pass untrusted session identifier input to `MongoDBChatMessageHistory` and store multiple users\u2019 histories in the same collection. An attacker who can invoke chat-history operations may be able to read, modify, or delete another user\u2019s stored conversation.\n\nApplications that derive the session identifier from an authenticated, server-controlled value and enforce its type are not affected by this path.\n\n## Patches\n\nThe issue is fixed in `@langchain/mongodb` version **1.3.1**.\n\nUsers of affected versions should upgrade to version 1.3.1 or later. The patched version validates session identifiers at runtime and ensures they are compared as literal values in MongoDB queries.\n\n## Workarounds\n\nIf an immediate upgrade is not possible, applications must reject session identifiers that are not non-empty strings. Session identifiers should be derived from an authenticated, server-controlled value and must not be passed directly from an untrusted request field.\n\nUpgrading remains the recommended remediation.",
  "id": "GHSA-m6rx-h84q-8r95",
  "modified": "2026-10-08T17:52:22Z",
  "published": "2026-10-08T17:52:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-m6rx-h84q-8r95"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106119"
    },
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langchainjs/pull/11672"
    },
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langchainjs/commit/946e3d856ff1f8ce7f7b9374c83f680a6ada79af"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/langchain-ai/langchainjs"
    },
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langchainjs/releases/tag/@langchain/mongodb@1.3.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "LangChain: MongoDBChatMessageHistory query injection can allow cross-session access"
}

Sightings

Author	Source	Type	Date	Other

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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-106119 (GCVE-0-2026-106119)

FKIE_CVE-2026-106119

GHSA-M6RX-H84Q-8R95

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