CVE-2026-114655

libmongocrypt builds requests to external key management services (AWS, Azure and GCP) by inserting values from key vault documents, KMS provider configuration and KMS responses into request lines, headers and signed request bodies without validating or encoding them for each context. A user with write access to the key vault collection can alter the structure of these requests, including adding members to request bodies and token claims that the library then signs with the application's credentials. This may result in key management operations being performed with parameters the application did not intend.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/mongodb/libmongocrypt/releases/tag/1.21.1
https://github.com/mongodb/libmongocrypt/security/advisories/GHSA-7mvq-mg47-m88j
https://jira.mongodb.org/browse/MONGOCRYPT-963

Configurations

No configuration.

History

22 Oct 2026, 21:17

Type	Values Removed	Values Added
References		() https://github.com/mongodb/libmongocrypt/security/advisories/GHSA-7mvq-mg47-m88j -

22 Oct 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-22 19:17

Updated : 2026-10-30 20:17

NVD link : CVE-2026-114655

Mitre link : CVE-2026-114655

CVE.ORG link : CVE-2026-114655

JSON object : View

Products Affected

No product.

CWE

CWE-74

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

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