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CVE-2026-18701 MongoDB CVE debrief

CVE-2026-18701 is a denial-of-service vulnerability in MongoDB Server's query subsystem. An authenticated user with read privileges can cause the server process to terminate unexpectedly by submitting a specially formed query filter. This issue affects multiple versions of MongoDB Server, including 7.0.0 to 7.0.40, 8.0.0 to 8.0.29, 8.2.0 to 8.2.12, and 8.3.0 to 8.3.8, as well as some alpha versions of 9.0.0 and 9.1.0.

Vendor
MongoDB
Product
MongoDB Server
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-09-16
Advisory published
2026-08-11
Advisory updated
2026-09-16

Who should care

Defenders and administrators of MongoDB Server instances should assess exposure and prioritize patching, especially for instances exposed to authenticated users. This includes database administrators, security teams, and IT personnel responsible for maintaining MongoDB deployments.

Why it matters

CVE-2026-18701 is a denial-of-service vulnerability in MongoDB Server's query subsystem that can be exploited by an authenticated user with read privileges. Defenders should prioritize verifying and patching affected instances, restricting query filter access, and monitoring server stability.

  • Potential service disruption due to server process termination
  • Need for verification and patching of affected MongoDB Server instances
  • Requirement to restrict query filter access to authenticated users with read privileges
  • Importance of monitoring server process stability and query filter submissions

Technical summary

The vulnerability is in the query subsystem of MongoDB Server, allowing an authenticated user with read privileges to cause the server process to terminate unexpectedly by submitting a specially formed query filter. This results in a denial-of-service condition.

Defensive priority

Defenders should prioritize verifying and patching affected MongoDB Server instances, especially those exposed to authenticated users.

Recommended defensive actions

  • Verify and patch affected MongoDB Server instances
  • Restrict query filter access to authenticated users with read privileges
  • Monitor server process stability and query filter submissions

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, its impact, and affected versions. A vendor advisory and issue tracking reference are also available.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-18701 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-18701

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-18701 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-18701

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.