CVE-2026-11933 PUBLISHED

Post-authentication use-after-free in server-side JavaScript BSON-to-array conversion

Assigner: mongodb
Reserved: 10.06.2026 Published: 12.06.2026 Updated: 12.06.2026

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
CVSS Score: 8.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	MongoDB
Product	MongoDB
Versions	Default: unaffected affected from 8.3.0 to 8.3.3 (incl.) affected from 8.2.0 to 8.2.10 (incl.) affected from 8.0.0 to 8.0.25 (incl.) affected from 7.0.0 to 7.0.36 (incl.) affected from 6.0 to 6.0.28 (incl.) affected from 5.0 to 5.0.33 (incl.) affected from 4.4.0 to 4.4.30 (incl.)

References

https://jira.mongodb.org/browse/SERVER-128125

Problem Types

CWE-787: Out-of-bounds Write CWE