CVE WatchOct 22, 2026

CVE-2026-114655

libmongocrypt builds requests to external key management services (AWS, Azure and GCP) by inserting values from key vault documents, KMS pro

CVSS

5.9

Medium

EPSS

0.3%

p18

KEV

—

Exploit Today

0-100

Published: Oct 22, 2026 · Last modified: Oct 22, 2026 · CWE-74

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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