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Vulnerability record · CVE-2026-81523 · published 27 August 2026

CVE-2026-81523: Mongodb libmongocrypt injection vulnerability

Mongodb · Libmongocrypt

A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.

2.0 CVSS 4.0 Low EPSS 0.10% · top 99.3% CWE-74 · Injection
2.0CVSS 4.0 base score
0.10%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Sep 2026Last modified by NVD

Description

A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/mongodb/libmongocrypt/releases/tag/1.20.3 Product
https://jira.mongodb.org/browse/MONGOCRYPT-977 Vendor AdvisoryIssue TrackingPatch

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-81523), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.