CVE-2026-11933
Post-authentication use-after-free in server-side JavaScript BSON-to-array conversion
EPSS 0.38%
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.
How to fix CVE-2026-11933
To remediate CVE-2026-11933, upgrade the affected package to a fixed version below.
- —upgrade to 4.4.31 or later
Is CVE-2026-11933 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 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
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |