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NVD Vulnerability Details :
CVE-2026-6340
Undergoing Analysis
More InfoOfficial Page
Source-responsibledisclosure@mattermost.com
View Known Exploited Vulnerability (KEV) details
Published At-18 May, 2026 | 08:16
Updated At-18 May, 2026 | 17:32

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate 7zip archive structure before processing which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted 7zip file with excessive folder declarations.. Mattermost Advisory ID: MMSA-2026-00573

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Type: Secondary
Version: 3.1
Base score: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-789Secondaryresponsibledisclosure@mattermost.com
CWE ID: CWE-789
Type: Secondary
Source: responsibledisclosure@mattermost.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://mattermost.com/security-updatesresponsibledisclosure@mattermost.com
N/A
Hyperlink: https://mattermost.com/security-updates
Source: responsibledisclosure@mattermost.com
Resource: N/A
Change History
0Changes found
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