# CVE-2026-114655: KMS request injection via unsanitized key vault and provider values in libmongocrypt

> CVE-2026-114655: KMS request injection via unsanitized key vault and provider values in libmongocrypt. CVSS 5.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-114655
Last updated: 2026-10-23T19:45:03Z

- Published: 2026-10-22 19:14 UTC · Updated: 2026-10-23 19:45 UTC · Assigner: mongodb
- CVSS: 5.9 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
- EPSS: 0.27%, 19th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-74

## 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.

## Affected vendors and products

- MongoDB: libmongocrypt

## Tracked companies

- [MongoDB Atlas](https://rewindex.com/company/mongodb-atlas.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-114655)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-114655)
- [https://github.com/mongodb/libmongocrypt/releases/tag/1.21.1](https://github.com/mongodb/libmongocrypt/releases/tag/1.21.1)
- [https://github.com/mongodb/libmongocrypt/security/advisories/GHSA-7mvq-mg47-m88j](https://github.com/mongodb/libmongocrypt/security/advisories/GHSA-7mvq-mg47-m88j)
- [https://jira.mongodb.org/browse/MONGOCRYPT-963](https://jira.mongodb.org/browse/MONGOCRYPT-963)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-114655 · Markdown: https://rewindex.com/cve/CVE-2026-114655.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-114655 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:22.960Z