Vulnerability details
CVE-2026-18697
MongoDB Server
Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial of Service on mongos
CVSS 4.0
8.7High
Official description
An issue in MongoDB Server's aggregation framework could allow an unauthenticated party to cause a mongos (router) process to terminate unexpectedly by submitting a specially formed aggregation command. This could result in a denial of service, disrupting client connections routed through the affected mongos instance.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (mongodb) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (mongodb) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| MongoDB | MongoDB Server | 7.0 ≤ v < 7.0.40 | CVEProject cvelistV5 (CNA) |
| MongoDB | MongoDB Server | 8.0 ≤ v < 8.0.29 | CVEProject cvelistV5 (CNA) |
| MongoDB | MongoDB Server | 8.3.0 ≤ v < 8.3.8 | CVEProject cvelistV5 (CNA) |
References and advisories
1
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Details
- Published
- 2026-08-11
- Last updated
- 2026-08-11
- State
- Published
- Assigner (CNA)
- mongodb
Exploit prediction (EPSS)
0.44%
Probability of exploitation in 30 days
38.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-617Reachable Assertion