Description
An issue in MongoDB Server's query planner could allow an authenticated user with read-level privileges to cause the server process to terminate unexpectedly by submitting a specially formed query against a collection with a text index. This could result in a denial of service, affecting connected clients and in-flight operations.
Published: 2026-08-11
Score: 6 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

MongoDB Server’s query planner fails to validate input correctly, allowing an authenticated user with read-level access to submit a specially formed query against a collection that has a text index. The malformed query causes the server process to terminate unexpectedly, leading to a denial of service that interrupts all connected clients and any in‑flight operations. The vulnerability is a classic instance of NULL pointer dereference, identified as CWE-476.

Affected Systems

MongoDB Server is the affected product. Any instance of the server running the affected code is vulnerable; the data does not specify exact version ranges, so all current releases before a vendor fix are potentially impacted.

Risk and Exploitability

The CVSS score of 6.0 indicates moderate impact. The EPSS score of less than 1% suggests a low probability of exploitation at present. Because the vulnerability requires an authenticated user with read permissions and a text‑indexed collection, the attack surface is somewhat limited and it is not listed in the CISA KEV catalog. The exploit path involves submitting a crafted query through any legitimate client connection.

Generated by OpenCVE AI on August 12, 2026 at 19:43 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade to a MongoDB Server release that contains the query planner patch
  • Restrict or remove read privileges from users that do not require access to text‑indexed collections
  • Monitor MongoDB logs for unexpected process terminations and anomalous query patterns
  • Apply application‑level input validation to detect and reject malformed queries before they reach the server

Generated by OpenCVE AI on August 12, 2026 at 19:43 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 12 Aug 2026 13:45:00 +0000

Type Values Removed Values Added
First Time appeared Mongodb
Mongodb mongodb Server
Vendors & Products Mongodb
Mongodb mongodb Server

Tue, 11 Aug 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 11 Aug 2026 19:00:00 +0000

Type Values Removed Values Added
Description An issue in MongoDB Server's query planner could allow an authenticated user with read-level privileges to cause the server process to terminate unexpectedly by submitting a specially formed query against a collection with a text index. This could result in a denial of service, affecting connected clients and in-flight operations.
Title Improper Input Validation in MongoDB Query Planner Leads to Denial of Service
Weaknesses CWE-476
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Mongodb Mongodb Server
cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-08-11T20:18:01.281Z

Reserved: 2026-08-03T15:53:36.628Z

Link: CVE-2026-18699

cve-icon Vulnrichment

Updated: 2026-08-11T20:17:57.490Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-11T19:17:24.270

Modified: 2026-08-28T21:16:15.740

Link: CVE-2026-18699

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-12T19:45:08Z

Weaknesses