High severity · published Jun 12, 2026
CVE-2026-11933
Post-authentication use-after-free in server-side JavaScript BSON-to-array conversion
8.8
CVSS
0.4%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
8.3.0 through 8.3.3; 8.2.0 through 8.2.10; 8.0.0 through 8.0.25; 7.0.0 through 7.0.36; 6.0 through 6.0.28; 5.0 through 5.0.33; +1 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-11933
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-11933
Patch
https://jira.mongodb.org/browse/SERVER-128125
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