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Review reviewHigh

CVE-2026-11933

MongoDB MongoDB, mongodb

A use-after-free vulnerability exists in MongoDB Server's server-side JavaScript engine when converting BSON documents to JavaScript arrays. An authenticated user with read privileges who is able to run server-side JavaScript (for example, via $where or $function) can cause the server to access memory that has already been freed. This may result in disclosure of information from the mongod process memory or a denial of service through a server crash.

CVSS
8.7
EPSS
0.38%
31.1% percentile
CISA KEV
Not listed
Published
2026.06.12
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.38%
Technical severityCVSS 8.7

Vulnerability overview

A use-after-free vulnerability exists in MongoDB Server's server-side JavaScript engine when converting BSON documents to JavaScript arrays. An authenticated user with read privileges who is able to run server-side JavaScript (for example, via $where or $function) can cause the server to access memory that has already been freed. This may result in disclosure of information from the mongod process memory or a denial of service through a server crash.

Affected product and versions

Product
MongoDB MongoDB, mongodb
Affected versions
8.3.0, 8.2.0, 8.0.0, 7.0.0, 6.0, 5.0, 4.4.0, >= 4.4.0 < 4.4.31, >= 5.0.0 < 5.0.34, >= 6.0.0 < 6.0.29, >= 7.0.0 < 7.0.37, >= 8.0.0 < 8.0.26, >= 8.2.0 < 8.2.11, >= 8.3.0 < 8.3.4
Fixed versions
4.4.31, 5.0.34, 6.0.29, 7.0.37, 8.0.26, 8.2.11, 8.3.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that MongoDB MongoDB, mongodb and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE
CWE-416, CWE-787