MongoDBCVE-2026-18687
MongoDB Server: resource exhaustion
High7.1CVE-2026-18687 · Published Aug 11, 2026 · updated Sep 16, 2026
MongoDB Server's handling of a Queryable Encryption maintenance operation did not properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privileges could submit a specially formed request that leads to a server crash or excessive internal writes, resulting in resource exhaustion and corruption of encrypted index data.
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:N/VI:L/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-191
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: use after free | High7.1 | 8.3.8+1 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 |