CVE-2026-81523: CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in MongoDB libmongocrypt
Description
CVE-2026-81523 is a low-severity vulnerability in MongoDB's libmongocrypt library version 1.0.0. It involves improper neutralization of special elements in output used by a downstream component, specifically a missing input validation in the automatic-encryption context setup. This allows a caller-supplied database identifier to be accepted without sanitization, potentially leading to incorrect schema selection and limited disclosure or modification of application-handled information.
CVSS v4.0
Score 2.0low
Affected software
MongoDB
libmongocrypt
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in MongoDB libmongocrypt 1.0.0 arises from a lack of input validation on the database identifier during automatic-encryption context setup. The unsanitized input can cause the system to select an incorrect schema, which may result in limited information disclosure or modification within the application. The issue is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component).
Potential Impact
The impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application. There is no indication of privilege escalation, denial of service, or remote code execution. The CVSS score of 2 (low) reflects the limited scope and impact of this vulnerability.
Mitigation Recommendations
No official patch or remediation level has been provided by the vendor as of the published date. Patch status is not yet confirmed — check the MongoDB vendor advisory for current remediation guidance. Until a fix is available, users should carefully validate and sanitize any database identifiers supplied to libmongocrypt to mitigate potential misuse.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-08-26T22:13:50.099Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a909cffacd9273b49b2d37e
Added to database: 08/27/2026, 20:24:31 UTC
Last enriched: 09/10/2026, 03:54:05 UTC
Last updated: 10/11/2026, 06:48:19 UTC
Views: 81
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