CVE-2026-3114 MEDIUM

CVE-2026-3114: Zip Bomb Denial of Service via Unrestricted Archive Decompression

Vendor Mattermost
Product Mattermost
Weakness CWE-409
Published March 26, 2026
Last update March 26, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

March 26, 2026 CVE published
March 26, 2026 Record updated