CVE-2026-18695

Improper Input Validation in MongoDB Timeseries Query Processing Leads to Denial of Service

CVE-2026-18695 is fixed in MongoDB on 1 platform by MongoDB 8.3.11 (version 8.3.11), released September 9, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.1

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0040

34th percentile

An issue in MongoDB Server's handling of certain query predicates against time-series collections with a metaField could allow an authenticated user with write access to cause the server process to terminate unexpectedly, resulting in a denial of service.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
MongoDB	8.3.11	MongoDB 8.3.11	Sep 9, 2026

Details

Published
August 11, 2026
Weakness
CWE-617: Reachable Assertion
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-18695

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