Description
A memory management flaw in the MongoDB C Driver's handling of compressed responses may cause the client library to hold on to memory that is never released. An unauthenticated party that controls the database endpoint a client application connects to may cause repeated, unbounded memory growth in that application, which may result in the application becoming unavailable. No credentials, transport security settings, or user interaction are required.
Published: 2026-11-03
Score: 8.7 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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History

Tue, 03 Nov 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 03 Nov 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Mongodb
Mongodb c Driver
Vendors & Products Mongodb
Mongodb c Driver

Tue, 03 Nov 2026 20:15:00 +0000

Type Values Removed Values Added
Title mongo-c-driver leaks the decompressed reply buffer when an OP_COMPRESSED reply fails to parse (denial of service) MongoDB C Driver leaks the decompressed reply buffer when an OP_COMPRESSED reply fails to parse (denial of service)

Tue, 03 Nov 2026 19:00:00 +0000

Type Values Removed Values Added
Description A memory management flaw in the MongoDB C Driver's handling of compressed responses may cause the client library to hold on to memory that is never released. An unauthenticated party that controls the database endpoint a client application connects to may cause repeated, unbounded memory growth in that application, which may result in the application becoming unavailable. No credentials, transport security settings, or user interaction are required.
Title mongo-c-driver leaks the decompressed reply buffer when an OP_COMPRESSED reply fails to parse (denial of service)
Weaknesses CWE-401
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Mongodb C Driver
cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-11-03T20:11:43.371Z

Reserved: 2026-11-02T19:09:10.643Z

Link: CVE-2026-120678

cve-icon Vulnrichment

Updated: 2026-11-03T20:11:36.578Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-03T19:17:59.880

Modified: 2026-11-03T21:17:04.000

Link: CVE-2026-120678

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-03T20:45:01Z

Weaknesses
  • CWE-401

    Missing Release of Memory after Effective Lifetime