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
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Remediation

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History

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

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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

No data.

cve-icon NVD

Status : Awaiting Analysis

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

Modified: 2026-11-03T19:55:17.180

Link: CVE-2026-120678

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-03T20:30:12Z

Weaknesses