CVE-2026-3114

MEDIUM

Zip Bomb Denial of Service via Unrestricted Archive Decompression

Title source: cna
STIX 2.1

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory
MMSA-2026-00598
https://mattermost.com/security-updates

Scores

CVSS v3 6.5
EPSS 0.0001
EPSS Percentile 3.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-409
Status published
Products (12)
Mattermost/Mattermost 10.11.0 - 10.11.11
Mattermost/Mattermost 10.11.12
Mattermost/Mattermost 11.2.0 - 11.2.3
Mattermost/Mattermost 11.2.4
Mattermost/Mattermost 11.3.0 - 11.3.1
Mattermost/Mattermost 11.3.2
Mattermost/Mattermost 11.4.0
mattermost/mattermost 11.4.0 - 11.4.1Go
Mattermost/Mattermost 11.4.1
Mattermost/Mattermost 11.5.0
... and 2 more
Published Mar 26, 2026
Tracked Since Mar 26, 2026