CVE-2026-18687: CWE-191: Integer Underflow (Wrap or Wraparound) in MongoDB MongoDB Server
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.
AI Analysis
Technical Summary
MongoDB Server's Queryable Encryption maintenance operation fails to properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privileges can exploit this integer underflow (CWE-191) vulnerability by submitting a specially crafted request. This results in a server crash or excessive internal writes, causing resource exhaustion and corruption of encrypted index data. The issue affects versions 8.0 and 8.3.0 of MongoDB Server. No official patch or remediation level has been published as of the data provided.
Potential Impact
Successful exploitation can cause denial of service through server crashes or resource exhaustion. Additionally, it can lead to corruption of encrypted index data, potentially impacting data integrity and availability for encrypted collections. The attacker requires authenticated readWrite privileges, limiting the attack surface to authorized users.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict readWrite privileges to trusted users only and monitor for unusual activity related to Queryable Encryption operations. Avoid running untrusted queries that could trigger this vulnerability.
CVE-2026-18687: CWE-191: Integer Underflow (Wrap or Wraparound) in MongoDB MongoDB Server
Description
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.
CVSS v4.0
Score 7.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
MongoDB Server's Queryable Encryption maintenance operation fails to properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privileges can exploit this integer underflow (CWE-191) vulnerability by submitting a specially crafted request. This results in a server crash or excessive internal writes, causing resource exhaustion and corruption of encrypted index data. The issue affects versions 8.0 and 8.3.0 of MongoDB Server. No official patch or remediation level has been published as of the data provided.
Potential Impact
Successful exploitation can cause denial of service through server crashes or resource exhaustion. Additionally, it can lead to corruption of encrypted index data, potentially impacting data integrity and availability for encrypted collections. The attacker requires authenticated readWrite privileges, limiting the attack surface to authorized users.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict readWrite privileges to trusted users only and monitor for unusual activity related to Queryable Encryption operations. Avoid running untrusted queries that could trigger this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-08-03T15:52:40.368Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7b6d42bf8831d539336148
Added to database: 08/11/2026, 18:43:14 UTC
Last enriched: 08/11/2026, 19:13:28 UTC
Last updated: 08/11/2026, 23:14:06 UTC
Views: 5
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