Is CVE-2026-104004 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-104004 being exploited in the wild.

How severe is CVE-2026-104004?

Medium severity, with a CVSS score of 6.5, published 13 October 2026.

Which products and versions are affected?

MongoDB Server before 8.0.34, 8.3.13, 9.0.4, and 9.1.0-rc1024.

Is there a fix for CVE-2026-104004?

Yes: fixed in 8.0.34, 8.3.13, 9.0.4, 9.1.0-rc1024. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-104004 attacked?

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

Am I affected by CVE-2026-104004?

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-2026-104004: MongoDB Server denial of service in collection validation

CVE-2026-104004 · Severity: medium · CVSS 6.5 · Published 2026-10-13

MongoDB Server, a widely-used NoSQL database, has a flaw in its collection validation feature that can crash the database process when certain malformed validation rules are used. An authenticated database user with write permissions can trigger a server crash by inserting a document that matches a specifically-crafted validator expression, causing an outage until the server is manually restarted.

Technologies: MongoDB Server. Vendors: MongoDB.

Quick answers

Is CVE-2026-104004 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-104004 being exploited in the wild.
How severe is CVE-2026-104004?: Medium severity, with a CVSS score of 6.5, published 13 October 2026.
Which products and versions are affected?: MongoDB Server before 8.0.34, 8.3.13, 9.0.4, and 9.1.0-rc1024.
Is there a fix for CVE-2026-104004?: Yes: fixed in 8.0.34, 8.3.13, 9.0.4, 9.1.0-rc1024. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-104004 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-104004?: 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: 8.0.34, 8.3.13, 9.0.4, 9.1.0-rc1024

Technical details

The collection validation feature in MongoDB Server improperly processes certain expressions stored in validators, leading to a denial of service. An authenticated attacker with write access can insert a document that triggers the vulnerable code path in the validation layer, causing the server process to terminate. A fix is available in MongoDB Server 8.0.34, 8.3.13, 9.0.4, and 9.1.0-rc1024 or later.

Affected products

MongoDB Server before 8.0.34, 8.3.13, 9.0.4, and 9.1.0-rc1024

Timeline

2026-10-13: disclosed
2026-10-12: patched

References

https://jira.mongodb.org/browse/SERVER-131412

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