CVE-2026-55253

HIGHPre-NVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (43rd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

LangChain MongoDB provides integrations between MongoDB, Atlas, LangChain, and LangGraph. Prior to langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0, MongoDBSaver.list(), MongoDBSaver.alist(), and MongoDBStore.search() incorporate filter dictionaries into MongoDB queries without recursively rejecting keys prefixed with $. An authenticated caller who controls a filter argument through HTTP query parameters, request body fields, or agent tool arguments can inject MongoDB Query Language operators such as $regex or $where. In a multi-tenant deployment that uses the filter to enforce per-user or per-tenant isolation, injected operators can bypass intended equality filtering and expose other tenants' checkpoint or store data. Filters constructed entirely from trusted server-side values have lower practical risk. This issue is fixed in langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0.

CVSS v3
7.7
EG Score
7.7HIGHmedium confidence
EG Risk
35
EG Risk 35/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity77% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 20, 2026

Last Modified

September 30, 2026

Advisory Details (5)

Auto-updated Sep 14, 2026
Patch available. Sources: github, github_pr, github_commit.
github_commit

commit 5465e4d3ea0e (langchain-ai/langchain-mongodb)

Fix landed in langchain-ai/langchain-mongodb commit 5465e4d3ea0e — awaiting tagged release

https://github.com/langchain-ai/langchain-mongodb/commit/5465e4d3ea0ef5c88a666a6442bd853ff4bd70e5
github_commit

commit 240e7ecee432 (langchain-ai/langchain-mongodb)

Fix landed in langchain-ai/langchain-mongodb commit 240e7ecee432 — awaiting tagged release

https://github.com/langchain-ai/langchain-mongodb/commit/240e7ecee432ea006d9fef6ea506bfd2e009a3f4
github_commit Patch Available

commit 14a6cc39e67d (langchain-ai/langchain-mongodb)

Patch available: langchain-ai/langchain-mongodb libs/langgraph-checkpoint-mongodb/v0.4.0 (contains commit 14a6cc39e67d)

https://github.com/langchain-ai/langchain-mongodb/commit/14a6cc39e67d23fd409cd13a9caae2c329df0a09
github_pr Patch Available

[INTPYTHON-961] Reject MQL operator keys in filter dicts to prevent query injection

Patch available: langchain-ai/langchain-mongodb libs/langgraph-checkpoint-mongodb/v0.4.0 (PR #384 merged 2026-05-08)

https://github.com/langchain-ai/langchain-mongodb/pull/384
githubMentions a patch (unverified)

NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure · Advisory · langchain-ai/langchain-mongodb · GitHub

https://github.com/langchain-ai/langchain-mongodb/security/advisories/GHSA-533j-2v4q-mw5h

Vendor Advisories for CVE-2026-55253(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 1 ecosystem)
PyPI(2)
PackageVulnerable rangeFix by version rangeDependents
langgraph-checkpoint-mongodb0.1.0 ... 0.2.2 (11 versions)
  • every version up to 0.3.0: fixed in 0.3.0
—
langgraph-store-mongodb0.0.1, 0.1.0, 0.1.1, 0.2.0, 0.3.0
  • every version up to 0.4.0: fixed in 0.4.0
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-08 05:22 UTCEG score recompute
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 16:53 UTCEG score recompute
  6. 2026-10-06 15:18 UTCEPSS rescore
  7. 2026-10-06 03:27 UTCEG score recompute
  8. 2026-10-05 17:43 UTCEPSS rescore
  9. 2026-10-05 09:29 UTCEG score recompute
  10. 2026-10-04 23:22 UTCEPSS rescore
  11. 2026-10-03 16:47 UTCEG score recompute
  12. 2026-10-03 14:26 UTCEPSS rescore
  13. 2026-10-02 21:00 UTCEG score recompute
  14. 2026-10-02 17:56 UTCEPSS rescore
  15. 2026-10-01 21:29 UTCEG score recompute
  16. 2026-10-01 19:50 UTCEPSS rescore
  17. 2026-09-30 17:51 UTCEG score recompute
  18. 2026-09-30 15:03 UTCEPSS rescore
  19. 2026-09-30 08:13 UTCEG score recompute
  20. 2026-09-29 15:22 UTCEPSS rescore
  21. 2026-09-29 03:49 UTCEG score recompute
  22. 2026-09-28 16:03 UTCEG score recompute
  23. 2026-09-28 13:51 UTCEPSS rescore
  24. 2026-09-27 15:57 UTCEG score recompute
  25. 2026-09-27 13:48 UTCEPSS rescore
Show 23 more
  1. 2026-09-27 03:02 UTCEG score recompute
  2. 2026-09-26 15:59 UTCEPSS rescore
  3. 2026-09-24 20:05 UTCEG score recompute
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-23 20:35 UTCEG score recompute
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-22 21:05 UTCEG score recompute
  8. 2026-09-22 09:21 UTCEG score recompute
  9. 2026-09-20 21:28 UTCEG score recompute
  10. 2026-09-20 20:16 UTCEPSS rescore
  11. 2026-09-19 21:57 UTCEG score recompute
  12. 2026-09-18 21:39 UTCEG score recompute
  13. 2026-09-18 19:28 UTCEPSS rescore
  14. 2026-09-17 21:19 UTCEG score recompute
  15. 2026-09-17 19:31 UTCEPSS rescore
  16. 2026-09-16 21:42 UTCEG score recompute
  17. 2026-09-16 14:08 UTCEPSS rescore
  18. 2026-09-16 09:41 UTCEG score recompute
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-14 20:27 UTCEG score recompute
  21. 2026-09-14 20:15 UTCEG score recompute
  22. 2026-09-14 18:35 UTCEG score recompute
  23. 2026-08-20 17:42 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55253?
CVE-2026-55253 is a high vulnerability published on August 20, 2026. LangChain MongoDB provides integrations between MongoDB, Atlas, LangChain, and LangGraph. Prior to langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0, MongoDBSaver.list(), MongoDBSaver.alist(), and MongoDBStore.search() incorporate filter dictionaries into MongoDB queries without…
When was CVE-2026-55253 disclosed?
CVE-2026-55253 was first published on August 20, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55253 actively exploited?
CVE-2026-55253 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55253?
CVE-2026-55253 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55253?
A fix for CVE-2026-55253 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55253 are linked in the Vendor Advisories panel on this page.

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