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VULNERABILITIES

CVE-2026-3114 Details

Description

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip archives containing highly compressed entries (zip bombs) that exhaust server memory.. Mattermost Advisory ID: MMSA-2026-00598

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://mattermost.com/security-updates [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-409Improper Handling of Highly Compressed Data (Data Amplification)[email protected]

Affected Products

ProductVersions
mattermost mattermost server
>= 10.11.0, < 10.11.12
>= 11.2.0, < 11.2.4
>= 11.3.0, < 11.3.2
11.4.0

CPE

  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
  • cpe:2.3:a:mattermost:mattermost_server:11.4.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-3114
NVD Published Date:
Mar 26, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-3114 Details - Not Deferred