Is there a public exploit for CVE-2026-120809?

No public exploit for CVE-2026-120809 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-120809?

CVE-2026-120809 scores CVSS 6.1 (v4.0), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.37%.

What does CVE-2026-120809 affect?

CVE-2026-120809 affects MONGODB MongoDB Server.

6.1 Medium

A use-after-free read issue exists in MongoDB’s SBE (Slot-Based Execution) engine when processing aggregation pipelines with $unwind on…

CVE-2026-120809

A use-after-free read issue exists in MongoDB’s SBE (Slot-Based Execution) engine when processing aggregation pipelines with $unwind on time-series collections. An internal error in state-preservation logic can cause a value still referenced by downstream stages to have its underlying memory freed prematurely. An authenticated user can craft an aggregation pipeline under specific conditions to trigger this condition, potentially reading recycled server heap memory in query results or crashing the server. This issue is only triggerable when a non-default server parameter related to the SBE engine is enabled.

Assessment

CVSS: 6.1 (v4.0)
Severity: Medium
EPSS: 0.37% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 10 November 2026
Last updated: 13 November 2026
Affected: MONGODB · MongoDB Server
Assigner: mongodb

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

https://jira.mongodb.org/browse/SERVER-132279

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