Mongod can run out of stack memory when expressions create deeply nested documents
Priority LOW 31CWE-674Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-674.
Summary
MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce deeply nested documents. The issue arises in recursive functions because the server does not periodically check the depth of the expression.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00326 25th percentileScored 2026-11-07
Fix Fixed MongoDB Server (MongoDB Inc): 8.0.18, 7.0.29, 8.2.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MongoDB | MongoDB Server | 8.0 to before 8.0.18; 7.0 to before 7.0.29; 8.2 to before 8.2.2 | 8.0.18, 7.0.29, 8.2.2 | Patch available | CNA |
- MongoDB Server VendorMongoDB Affected 8.0 to before 8.0.18; 7.0 to before 7.0.29; 8.2 to before 8.2.2 Fixed in 8.0.18, 7.0.29, 8.2.2 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:* | 7.0.0 to before 7.0.29; 8.0.0 to before 8.0.18; 8.2.0 to before 8.2.2 | Vulnerable | MongoDB |
- cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:* Versions 7.0.0 to before 7.0.29; 8.0.0 to before 8.0.18; 8.2.0 to before 8.2.2 Vulnerable ·MongoDB
Remediation
- Fix · CNA MongoDB Server (MongoDB Inc) Fixed in 8.0.18, 7.0.29, 8.2.2
Timeline
- 2026-10-02 Threatist record created from CVE-2026-1849
- 2026-10-03 Alias added: GHSA-cf58-vmg8-228p
References
More Mongodb vulnerabilities
- TI-2025-13542 Zlib compressed protocol header length confusion may allow memory read KEVCVSS 4.0HIGH 8.7
- TI-2013-01669 MongoDB before 2.0.9 and 2.2.x before 2.2.4 does not properly validate requests to the… CVSS 2.0MEDIUM 6.0
- TI-2026-56639 Uncontrolled Resource Consumption in MongoDB Sharded Cluster Router Allows Unauthenticated Denial of Service CVSS 4.0HIGH 8.7
- TI-2026-56628 Reachable assertion in MongoDB Server CVSS 4.0HIGH 8.7
- TI-2026-15322 Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial of Service on mongos CVSS 4.0HIGH 8.7
- TI-2026-08537 Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow CVSS 4.0HIGH 8.7
Sources
- CVE-2026-1849 · CVE Program
- CVE-2026-1849 · NVD
- FIRST EPSS
- GHSA-cf58-vmg8-228p · GitHub Advisory Database · CC BY 4.0
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