CVE-2026-18687 json
Improper Validation in MongoDB Queryable Encryption Maintenance Operation Leads to Denial of Service and Index Corruption
published 2026-08-11 2 mo ago modified 2026-10-23 16 d ago also BIT-mongodb-2026-18687 , EUVD-2026-56864
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 14%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami mongodb 8.0.29, 8.3.8, 9.0.2
- MongoDB MongoDB Server 8.0.29, 8.3.8
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.1 | 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 |
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H |
| CNA | 4.0 | 7.1 | 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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mongodb | >=8.0.0, <8.0.29 >=8.2.0, <8.3.8 >=9.0.0, <9.0.2 |
8.0.29 8.3.8 9.0.2 |
Affected products
- MongoDB MongoDB Server
Classification
- Weakness
-
- CWE-191 Integer Underflow (Wrap or Wraparound)
- Technology feeds
References
-
jira.mongodb.org
/browse/SERVER-130628
vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-18687
web
Sources
- CVE List CVE-2026-18687
- NVD CVE-2026-18687
- OSV BIT-mongodb-2026-18687
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