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High, CVSS 7.7

LangChain MongoDB has NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure

CVE-2026-55253GHSA-533j-2v4q-mw5h

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (langgraph-store-mongodb 0.4.0; langgraph-checkpoint-mongodb 0.3.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.7 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
EPSS
  • CVE-2026-55253: 0.53% estimated exploitation activity in the next 30 days; percentile 44.96 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Executive Summary A NoSQL injection issue exists in the langgraph-checkpoint-mongodb and langgraph-store-mongodb libraries. MongoDBSaver.list() and MongoDBStore.search() methods accept a filter parameter that is incorporated into MongoDB queries without sufficient validation. Because MongoDB query operator keys (those prefixed with $) are not rejected during filter construction, a caller with control of the filter input can embed MongoDB query operators directly into the query. --- CVSS Details CVSS 4.0 | Field | Value | |---|---| | CVSS Version | 4.0 | | Vector String | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N | | Base Score | 7.1 (High) | | Metric | Value | Rationale | |---|---|---| | Attack Vector (AV) | Network | Triggerable remotely via API | | Attack Complexity (AC) | Low | No special conditions required | | Attack Requirements (AT) | None | No prerequisite deployment or execution conditions | | Privileges Required (PR) | Low | Authenticated caller of the…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-533j-2v4q-mw5h

Agent brief

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# Patch Next advisory brief: CVE-2026-55253

Advisory: LangChain MongoDB has NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure
IDs: CVE-2026-55253, GHSA-533j-2v4q-mw5h
Record: https://patchnext.com/advisories/cve-2026-55253 (revision 1, source checked 26 Oct 2026, 13:50 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: langgraph-store-mongodb 0.4.0; langgraph-checkpoint-mongodb 0.3.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI langgraph-store-mongodb: affected < 0.4.0; fixed in 0.4.0
- PyPI langgraph-checkpoint-mongodb: affected < 0.3.0; fixed in 0.3.0

## Suggested inspection (read-only)
- `python -m pip show langgraph-store-mongodb`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show langgraph-checkpoint-mongodb`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on langgraph-store-mongodb, langgraph-checkpoint-mongodb.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-533j-2v4q-mw5h (GitHub-reviewed advisory GHSA-533j-2v4q-mw5h lists affected ranges: PyPI langgraph-checkpoint-mongodb >=0 =0 <0.4.0)

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