MongoDBCVE-2026-18711
MongoDB Server: use after free
High7.1CVE-2026-18711 · Published Aug 11, 2026 · updated Sep 25, 2026
An issue in MongoDB Server's query execution engine could allow an authenticated user with read and write privileges to cause an internal reference to be used after the underlying memory has been freed, when running certain queries against time-series collections. This could result in a server crash or disclosure of freed memory contents within query results.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| MongoDB Server Product | >= 8.3.0, < 8.3.8 | 8.3.8 |
| >= 8.0, < 8.0.29 | 8.0.29 |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/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
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-416
More MongoDB advisories
All MongoDB| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Aug 11 | Cleartext Storage of Sensitive Information in MongoDB Driver Logging During Client Initialization | Medium6.5 | 5.9.2+1 more |
| Aug 11 | MongoDB Server: improper authorization | High7.2 | 8.3.8+2 more |
| Aug 11 | MongoDB Server: missing authorization | High7.1 | 8.3.8 |
| Aug 11 | MongoDB Server: untrusted input in a security decision | High7.1 | 8.3.8+2 more |
| Aug 11 | MongoDB Server: use after free | High7.5 | 8.3.8 |
| Aug 11 | MongoDB Server: denial of service | Medium5.3 | 8.3.8 |