# CVE-2026-114655: libmongocrypt: libmongocrypt builds requests to external key management services (AWS, Azure and GCP) by inserting values from key v...

CVE-2026-114655 is fixed in libmongocrypt on 1 platform by DEBIAN-CVE-2026-114655 (version 1.21.1-1), released October 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-114655
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 22, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmongocrypt Debian 14 | 1.21.1-1 | [DEBIAN-CVE-2026-114655](https://patchblox.com/security/data/fix/linux/debian-cve-2026-114655.md) | Oct 28, 2026 |

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Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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