CVSS 4.0
9.5 criticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:HCVE-2026-118383 Pre-authentication use-after-free in MongoDB Server replica set primary catch-up
Critical (9.5) in mongodb mongodb. EPSS 0.7% estimated probability of exploitation activity in the next 30 days.
On this page
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.
Severity
CVSS 3.1
10.0 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H- EPSS
- 0.7% estimated probability of exploitation activity in the next 30 days; 54th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: no · Technical impact: total, assessed 2026-11-13. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-416 Use After Free
- Published
- Modified
- Assigned by
- mongodb (CNA)
- NVD analysis
- Analyzed
- Record from
- the NVD, synced
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| MongoDB Server | from 9.0.0 before 9.0.7 |
| MongoDB Server | from 8.3.0 before 8.3.16 |
| MongoDB Server | from 8.0.0 before 8.0.37 |
| MongoDB Server | from 7.0.0 before 7.0.48 |
| MongoDB Server | from 6.0.0 before 6.0.30 |
| MongoDB Server | from 5.0.0 before 5.0.35 |
| MongoDB Server | from 4.4.0 before 4.4.32 |
Fix and patched versions
- Patch: https://jira.mongodb.org/browse/SERVER-138119
- Patch: https://jira.mongodb.org/browse/SERVER-138175
- Vendor advisory: https://jira.mongodb.org/browse/SERVER-138119
- Vendor advisory: https://jira.mongodb.org/browse/SERVER-138175
GitHub PoC (unverified)
Repositories on GitHub named after this CVE. Nobody has checked them and they are not scanned: some hold a working proof of concept, some nothing useful, and some malware made to look like one. Read the code before you run any of it.
- googlesky/CVE-2026-118383 1 star, Python, created
PoC for CVE-2026-118383 — MongoDB unauthenticated use-after-free in ReplicationCoordinatorImpl::CatchupState during primary catch-up via re…
History
- Analyzed by the NVD
Changes since this site first stored the record. The same for every record: /api/public/changes.