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Vulnerability record · CVE-2026-84962 · published 3 September 2026

CVE-2026-84962: Mongodb libmongocrypt vulnerability

Mongodb · Libmongocrypt

An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and defeating client-side encryption.

5.7 CVSS 4.0 Medium EPSS 0.19% · top 92.8% CWE-93 · CWE-93
5.7CVSS 4.0 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Sep 2026Last modified by NVD

Description

An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and defeating client-side encryption.

CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:H/VI:N/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://jira.mongodb.org/browse/MONGOCRYPT-960 Vendor AdvisoryPermissions Required

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Related vulnerabilities

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

7.1CVE-2026-84971Mongodb libmongocrypt vulnerabilityImproper handling of an unexpected value size in the decryption path of a client-side encryption library can cause a failed internal check that termi…EPSS 0.26%2.0CVE-2026-81523Mongodb libmongocrypt injection vulnerabilityA missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be acc…EPSS 0.10%7.5CVE-2025-61884Oracle E-Business Suite Configurator pre-auth data exposure flawOracle Configurator in Oracle E-Business Suite 12.2.3 through 12.2.14 exposes a vulnerability reachable over HTTP without authentication. A successfu…KEVEPSS 96%analysed

Source: NIST National Vulnerability Database (record CVE-2026-84962), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.