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OpenAdvisories
High · 7.1 CVE-2026-18711 EUVD-2026-56884GHSA-xv7q-6jr5-mw96

Use-After-Free in MongoDB Query Execution Engine Leads to Denial of Service and Potential Memory Disclosure

Published Aug 11, 2026 · Updated Aug 11, 2026 · Assigned by mongodb

Description

An issue in MongoDB Server's query execution engine could allow an authenticated user with read and write privileges to cause an internal reference to be used after the underlying memory has been freed, when running certain queries against time-series collections. This could result in a server crash or disclosure of freed memory contents within query results.

Affected products

VendorProductAffectedFixed
MongoDB MongoDB Server 8.3.0 – < 8.3.8, 8.0 – < 8.0.29 8.3.8

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Ubuntu Pro 20.04 LTS mongodb No fix yet —
Ubuntu Pro 18.04 LTS mongodb No fix yet —
Ubuntu Pro 16.04 LTS mongodb No fix yet —
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 14.04 LTS mongodb No fix yet —

Advisories 1

References