Vulnerability DatabaseCVE-2026-3114
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CVE-2026-3114
March 26, 2026
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
Affected Packages
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.3.0 <v11.3.2
Fix Suggestion:
Update to version v11.3.2
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.2.0 <v11.2.4
Fix Suggestion:
Update to version v11.2.4
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.2.0 <v11.2.4
Fix Suggestion:
Update to version v11.2.4
github.com/mattermost/mattermost (GO):
Affected version(s) =v11.4.0 <v11.4.1
Fix Suggestion:
Update to version v11.4.1
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.12
Fix Suggestion:
Update to version v10.11.12
github.com/mattermost/mattermost (GO):
Affected version(s) =v11.4.0 <v11.4.1
Fix Suggestion:
Update to version v11.4.1
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.3.0 <v11.3.2
Fix Suggestion:
Update to version v11.3.2
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.12
Fix Suggestion:
Update to version v10.11.12
Related Resources (1)
https://mattermost.com/security-updates
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Handling of Highly Compressed Data (Data Amplification)
CWE-409
EPSS
Base Score:
0.03