CVE-2026-81522: CWE-116: Improper Encoding or Escaping of Output in MongoDB C++ Driver
Description
CVE-2026-81522 is a high-severity vulnerability in the MongoDB C++ Driver version 3.0.0. It involves improper encoding or escaping of output related to namespace identifiers constructed from untrusted input. This flaw can allow an attacker to manipulate namespace identifiers with special characters, potentially causing operations to target unintended data. The impact includes limited unauthorized read and write access to data belonging to other logical tenants within the affected application.
CVSS v4.0
Score 8.6high
Affected software
MongoDB
C++ Driver
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The MongoDB C++ Driver version 3.0.0 contains a CWE-116 vulnerability where improper encoding or escaping of caller-supplied namespace identifiers allows special characters to be embedded. If an application builds namespace identifiers from untrusted input without proper validation, this can lead to operations being redirected to different targets than intended. This misdirection can result in limited unauthorized access to data of other logical tenants within the same application context.
Potential Impact
This vulnerability can lead to unauthorized read and write access to data belonging to other logical tenants of the affected application, potentially violating data isolation and confidentiality. The impact is limited in scope but significant in multi-tenant environments where data separation is critical.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix or workaround is available, applications should validate and sanitize all untrusted input used to construct namespace identifiers to prevent injection of special characters.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-08-26T22:13:42.143Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a909cffacd9273b49b2d37c
Added to database: 08/27/2026, 20:24:31 UTC
Last enriched: 09/08/2026, 10:37:10 UTC
Last updated: 10/11/2026, 06:48:19 UTC
Views: 113
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.