CVE-2026-11933: A use-after-free vulnerability exists in MongoDB Server's server-side JavaScript engine when converting BSON documents to JavaScript arrays. An authenticated…

PriorityP350high8.8CVSS 3.1

AVNACLPRLUINSUCHIHAH

EPSS

0.38%

30.2th percentile

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

14 ranges

Vendor	Product	Version range	Fixed in
mongodb	mongodb	>= 4.4.0 < 4.4.31	4.4.31
mongodb	mongodb	4.4.0 – 4.4.30	—
mongodb	mongodb	5.0 – 5.0.33	—
mongodb	mongodb	>= 5.0.0 < 5.0.34	5.0.34
mongodb	mongodb	6.0 – 6.0.28	—
mongodb	mongodb	>= 6.0.0 < 6.0.29	6.0.29
mongodb	mongodb	>= 7.0.0 < 7.0.37	7.0.37
mongodb	mongodb	7.0.0 – 7.0.36	—
mongodb	mongodb	>= 8.0.0 < 8.0.26	8.0.26
mongodb	mongodb	8.0.0 – 8.0.25	—
mongodb	mongodb	>= 8.2.0 < 8.2.11	8.2.11
mongodb	mongodb	8.2.0 – 8.2.10	—
mongodb	mongodb	>= 8.3.0 < 8.3.4	8.3.4
mongodb	mongodb	8.3.0 – 8.3.3	—

CVSS provenance

nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvdv4.08.7HIGHCVSS: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

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.