An issue in MongoDB Server's handling of timeseries collections could allow an authenticated user with write privileges to cause an internal data… (CVE-2026-18693)
CVE-2026-18693 is a vulnerability in MongoDB Server's handling of timeseries collections. An authenticated user with write privileges can cause internal data structure inconsistencies through certain document insertions. This can lead to out-of-bounds memory access on subsequent inserts, potentially causing server crashes, limited memory exposure, or memory corruption.
AI Analysis
Technical Summary
This vulnerability involves improper handling of timeseries collections in MongoDB Server. Specifically, certain document insertions by an authenticated user with write privileges can corrupt internal data structures. Subsequent inserts into the affected bucket may trigger out-of-bounds memory access, resulting in denial of service, limited memory disclosure, or memory corruption. The issue is classified under CWE-787 (Out-of-bounds Write).
Potential Impact
An attacker with authenticated write access can cause the MongoDB server to crash (denial of service), expose limited memory contents, or corrupt memory. This can disrupt database availability and potentially leak sensitive data from memory.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor MongoDB vendor advisories for updates and apply patches once available.
An issue in MongoDB Server's handling of timeseries collections could allow an authenticated user with write privileges to cause an internal data… (CVE-2026-18693)
Description
CVE-2026-18693 is a vulnerability in MongoDB Server's handling of timeseries collections. An authenticated user with write privileges can cause internal data structure inconsistencies through certain document insertions. This can lead to out-of-bounds memory access on subsequent inserts, potentially causing server crashes, limited memory exposure, or memory corruption.
CVSS v3.1
Score 7.6high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper handling of timeseries collections in MongoDB Server. Specifically, certain document insertions by an authenticated user with write privileges can corrupt internal data structures. Subsequent inserts into the affected bucket may trigger out-of-bounds memory access, resulting in denial of service, limited memory disclosure, or memory corruption. The issue is classified under CWE-787 (Out-of-bounds Write).
Potential Impact
An attacker with authenticated write access can cause the MongoDB server to crash (denial of service), expose limited memory contents, or corrupt memory. This can disrupt database availability and potentially leak sensitive data from memory.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor MongoDB vendor advisories for updates and apply patches once available.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-4f9m-g9cm-wxq9
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-18693"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a7c9b72bf8831d539ce07ed
Added to database: 08/12/2026, 16:12:34 UTC
Last enriched: 08/12/2026, 17:28:31 UTC
Last updated: 08/13/2026, 02:41:00 UTC
Views: 2
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