Is CVE-2026-120812 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-120812 being exploited in the wild.

How severe is CVE-2026-120812?

Medium severity, with a CVSS score of 6.5, published 10 November 2026.

Which products and versions are affected?

MongoDB Server before 8.3.16 and 9.0.x before 9.0.7.

Is there a fix for CVE-2026-120812?

Yes: fixed in 8.3.16, 9.0.7. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-120812 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-120812?

Check whether you run MongoDB Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-120812: MongoDB Server denial of service in query processing

CVE-2026-120812 · Severity: medium · CVSS 6.5 · Published 2026-11-10

MongoDB Server contains a flaw in its query processing component that allows authenticated users with read access to crash the database server by submitting specially crafted queries against time-series collections. The vulnerability exploits uncontrolled recursion in the internal query compilation logic, leading to stack exhaustion and server termination. An attacker with legitimate database credentials and read permissions could trigger this denial of service.

Technologies: MongoDB Server. Vendors: MongoDB.

Quick answers

Is CVE-2026-120812 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-120812 being exploited in the wild.
How severe is CVE-2026-120812?: Medium severity, with a CVSS score of 6.5, published 10 November 2026.
Which products and versions are affected?: MongoDB Server before 8.3.16 and 9.0.x before 9.0.7.
Is there a fix for CVE-2026-120812?: Yes: fixed in 8.3.16, 9.0.7. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-120812 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-120812?: Check whether you run MongoDB Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 8.3.16, 9.0.7

Technical details

Uncontrolled recursion in the query compilation component (ABT tree generation and manipulation) can exhaust stack space when processing certain queries against time-series collections, causing server process termination. The vulnerability requires authentication and read-level database privileges. An attacker gains a denial of service condition affecting database availability.

Affected products

MongoDB Server before 8.3.16 and 9.0.x before 9.0.7

Timeline

2026-11-10: disclosed
2026-11-10: patched

References

https://jira.mongodb.org/browse/SERVER-131961

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