CVE-2026-118383

MongoDB Server critical remote code execution, CVSS 10.0.

A use-after-free in the replication component of MongoDB Server can occur when a newly elected replica set primary completes catch-up. The condition can be caused by requests that do not require authentication, and may result in the server terminating unexpectedly or, under certain conditions, arbitrary code execution in the context of the server process. Replica set members are affected, including the shard and config server replica set members of sharded clusters; standalone mongod instances are not.

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10.0CVSS base score: critical, the highest band

0.7%chance of exploitation in the next 30 days (EPSS), 55th percentile

10 Novfirst published, 2026

Not yeton CISA's exploited list, as of 14 November 2026

Vendor and product	MongoDB · MongoDB Server
Type	remote code execution
Severity	Critical 10.0 CVSS base score
Affected versions	MongoDB Server: 9.0.0 to before 9.0.7, 8.3.0 to before 8.3.16, 8.0.0 to before 8.0.37
First published	10 November 2026
Weakness	CWE-416: Use After Free
Exploited	Not confirmed. Critical flaws in MongoDB products have been exploited before: MongoDB appears on CISA's exploited list.

What to do

Patch before it is exploited

Step 1

Patch to the fixed version the vendor names, today if the product faces the internet.

Step 2

Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list.

Step 3

Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.

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Know the day it starts being used

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Questions

CVE-2026-118383 in short

Is CVE-2026-118383 being exploited?

Not confirmed as of 14 November 2026: CISA has not added it to its Known Exploited Vulnerabilities catalogue. Critical flaws in MongoDB products are a frequent target, so patch before that changes; this page is updated daily.

How severe is CVE-2026-118383?

NVD rates it critical, with a CVSS base score of 10.0.

Which versions of MongoDB Server are affected by CVE-2026-118383?

According to the CVE record: MongoDB Server: 9.0.0 to before 9.0.7, 8.3.0 to before 8.3.16, 8.0.0 to before 8.0.37. Check the vendor's advisory for the fixed version.

How do I fix CVE-2026-118383?

Patch to the fixed version the vendor names, today if the product faces the internet. Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list. Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.

Sources: NVD, the CVE record, FIRST EPSS and the CISA Known Exploited Vulnerabilities catalogue. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 14 November 2026.