Description
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
Published: 2026-10-08
Score: 7.1 High
EPSS: n/a
KEV: No
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Remediation

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Tracking

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Advisories

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History

Thu, 08 Oct 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Mongodb
Mongodb libmongocrypt
Vendors & Products Mongodb
Mongodb libmongocrypt

Thu, 08 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 08 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Description An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
Title Application denial of service via malformed KMS endpoint in MongoDB libmongocrypt
Weaknesses CWE-191
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Mongodb Libmongocrypt
cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-10-08T19:30:01.396Z

Reserved: 2026-10-06T16:40:35.016Z

Link: CVE-2026-106429

cve-icon Vulnrichment

Updated: 2026-10-08T19:29:58.023Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-08T19:16:58.750

Modified: 2026-10-08T20:49:23.240

Link: CVE-2026-106429

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-08T20:30:18Z

Weaknesses
  • CWE-191

    Integer Underflow (Wrap or Wraparound)