CVE-2026-18693: CWE-787: Out-of-bounds Write in MongoDB MongoDB Server
An issue in MongoDB Server's handling of timeseries collections could allow an authenticated user with write privileges to cause an internal data structure to become inconsistent through certain document insertions. A subsequent insert into the affected bucket could then result in the server accessing memory outside its intended bounds, potentially causing a server crash (denial of service), exposure of limited memory contents, or memory corruption.
AI Analysis
Technical Summary
This vulnerability (CWE-787) in MongoDB Server's handling of timeseries collections allows an authenticated user with write privileges to corrupt internal data structures through specific document insertions. Subsequent inserts into the affected bucket may cause out-of-bounds memory access, which can lead to denial of service via server crash, exposure of limited memory contents, or memory corruption. The issue affects MongoDB Server versions 7.0, 8.0, and 8.3.0. There is no official remediation or patch currently available, and no known exploits in the wild have been reported.
Potential Impact
An attacker with authenticated write access to MongoDB timeseries collections can cause the server to crash (denial of service), potentially expose limited memory contents, or corrupt memory. This could disrupt database availability and integrity but requires authenticated write privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict write access to trusted users only and monitor for unusual activity related to timeseries collections.
CVE-2026-18693: CWE-787: Out-of-bounds Write in MongoDB MongoDB Server
Description
An issue in MongoDB Server's handling of timeseries collections could allow an authenticated user with write privileges to cause an internal data structure to become inconsistent through certain document insertions. A subsequent insert into the affected bucket could then result in the server accessing memory outside its intended bounds, potentially causing a server crash (denial of service), exposure of limited memory contents, or memory corruption.
CVSS v4.0
Score 7.2high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-787) in MongoDB Server's handling of timeseries collections allows an authenticated user with write privileges to corrupt internal data structures through specific document insertions. Subsequent inserts into the affected bucket may cause out-of-bounds memory access, which can lead to denial of service via server crash, exposure of limited memory contents, or memory corruption. The issue affects MongoDB Server versions 7.0, 8.0, and 8.3.0. There is no official remediation or patch currently available, and no known exploits in the wild have been reported.
Potential Impact
An attacker with authenticated write access to MongoDB timeseries collections can cause the server to crash (denial of service), potentially expose limited memory contents, or corrupt memory. This could disrupt database availability and integrity but requires authenticated write privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict write access to trusted users only and monitor for unusual activity related to timeseries collections.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-08-03T15:53:26.435Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7b7422bf8831d539467f78
Added to database: 08/11/2026, 19:12:34 UTC
Last enriched: 08/11/2026, 19:28:29 UTC
Last updated: 08/11/2026, 22:52:37 UTC
Views: 3
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