MongoDB Server: remote code execution

MongoDB Server

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…

Do this now

Upgrade MongoDB Server to 9.0.7, 8.3.16, 8.0.37, or the other fixed versions, +4 more lines in Fix it.

Fix it

MongoDB Server

On 4.4.xUpgrade to MongoDB Server 4.4.32
On 5.0.xUpgrade to MongoDB Server 5.0.35
On 6.0.xUpgrade to MongoDB Server 6.0.30
On 7.0.xUpgrade to MongoDB Server 7.0.48
On 8.0.xUpgrade to MongoDB Server 8.0.37
On 8.3.xUpgrade to MongoDB Server 8.3.16
On 9.0.xUpgrade to MongoDB Server 9.0.7

First seen: 11 Nov 2026
Last update: 12 Nov 2026, 10:17 UTC
Fixed in: 9.0.7
8.3.16
8.0.37
7.0.48
6.0.30
5.0.35
4.4.32
Identifiers: CVE-2026-118383
CVSS: 9.0
Source: news

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## MongoDB Server: remote code execution
Severity: critical. Patch status: patched.
Affected: MongoDB Server
Fixed in: 9.0.7, 8.3.16, 8.0.37, 7.0.48, 6.0.30, 5.0.35, 4.4.32
Ids: CVE-2026-118383

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…

## Steps
1. Search the repo, its CI and infra config for MongoDB Server. If present, report the version in use and whether it's affected.
2. Fix by release line: MongoDB Server: 9.0.x → 9.0.7; 8.3.x → 8.3.16; 8.0.x → 8.0.37; 7.0.x → 7.0.48; 6.0.x → 6.0.30; 5.0.x → 5.0.35; 4.4.x → 4.4.32.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| MongoDB Server 9.0.x | fixed | 9.0.7 | — |
| MongoDB Server 8.3.x | fixed | 8.3.16 | — |
| MongoDB Server 8.0.x | fixed | 8.0.37 | — |
| MongoDB Server 7.0.x | fixed | 7.0.48 | — |
| MongoDB Server 6.0.x | fixed | 6.0.30 | — |
| MongoDB Server 5.0.x | fixed | 5.0.35 | — |
| MongoDB Server 4.4.x | fixed | 4.4.32 | — |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-118383") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://jira.mongodb.org/browse/SERVER-138119 https://nvd.nist.gov/vuln/detail/CVE-2026-118383 https://thehackernews.com/2026/11/critical-pre-auth-mongodb-flaw-cve-2026.html
https://pwned.coffee/i/a-use-after-free-in-the-replication-component-of-mongodb-cve-2026-118383

Timeline

12 Nov 2026, 10:17 UTC
Reported by thehackernews.com: Critical Pre-Auth MongoDB Flaw (CVE-2026-118383) Can Crash Lagging Servers on Failover
11 Nov 2026, 06:18 UTC
Fix status: unknown → patched.
11 Nov 2026
First reported.

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
MongoDB Server 9.0.0 to before 9.0.7 9.0.7 CVE record (CNA) checked 13 Nov
MongoDB Server 8.3.0 to before 8.3.16 8.3.16 CVE record (CNA) checked 13 Nov
MongoDB Server 8.0.0 to before 8.0.37 8.0.37 CVE record (CNA) checked 13 Nov
MongoDB Server 7.0.0 to before 7.0.48 7.0.48 CVE record (CNA) checked 13 Nov
MongoDB Server 6.0.0 to before 6.0.30 6.0.30 CVE record (CNA) checked 13 Nov
MongoDB Server 5.0.0 to before 5.0.35 5.0.35 CVE record (CNA) checked 13 Nov
MongoDB Server 4.4.0 to before 4.4.32 4.4.32 CVE record (CNA) checked 13 Nov
Score: CVSS 9.0 (critical). CVSS 3.1 9 (CNA mongodb) for CVE-2026-118383
Last checked: 13 Nov 2026, 16:26 UTC

Product	Affected	Fixed in	Source
MongoDB Server	9.0.0 to before 9.0.7	9.0.7	CVE record (CNA) checked 13 Nov
MongoDB Server	8.3.0 to before 8.3.16	8.3.16	CVE record (CNA) checked 13 Nov
MongoDB Server	8.0.0 to before 8.0.37	8.0.37	CVE record (CNA) checked 13 Nov
MongoDB Server	7.0.0 to before 7.0.48	7.0.48	CVE record (CNA) checked 13 Nov
MongoDB Server	6.0.0 to before 6.0.30	6.0.30	CVE record (CNA) checked 13 Nov
MongoDB Server	5.0.0 to before 5.0.35	5.0.35	CVE record (CNA) checked 13 Nov
MongoDB Server	4.4.0 to before 4.4.32	4.4.32	CVE record (CNA) checked 13 Nov

Sources: KEV – CVE record ✓ Vendor ✓

Sources

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