Description
An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed oplog entries, resulting in a potential denial of service on secondaries. This issue affects MongoDB Server v4.0 versions prior to 4.0.27; MongoDB Server v4.2 versions prior to 4.2.16; MongoDB Server v4.4 versions prior to 4.4.9.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| MongoDB | MongoDB Server | 4.0 – < 4.0.27, 4.2 – < 4.2.16, 4.4 – < 4.4.9 | 4.0.27 |
Advisories 2
- ICSA-26-218-01 ABB Ability Zenon CISA ICS & IT advisories · Aug 6, 2026
- 9AKK108472A9037 ABB AbilityTM zenon Security Risk Due to End-of-Life MongoDB Component ABB PSIRT · Jul 30, 2026