CVE-2026-14298
Received Received - Intake

Denial of Service in Mattermost

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: Mattermost, Inc.

Description
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to properly limit resource consumption when processing certain user-supplied input, which allows an authenticated user to cause a denial of service. Mattermost Advisory ID: MMSA-2026-00713

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-13
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-14298
EUVD
EUVD-2026-57742

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mattermost mattermost to 11.9.0 (inc)
mattermost mattermost to 11.8.4 (inc)
mattermost mattermost to 11.7.7 (inc)
mattermost mattermost to 10.11.22 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-409 The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output.

Attack-Flow Graph

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Executive Summary

Mattermost versions between 11.9.0 and earlier, 11.8.4 and earlier, 11.7.7 and earlier, and 10.11.22 and earlier fail to properly limit resource consumption when processing certain user-supplied input. This allows an authenticated user to cause a denial of service by consuming excessive server resources.

Impact Analysis

An authenticated attacker could exploit this to disrupt service availability by overloading the server with resource-intensive requests, leading to degraded performance or complete downtime for all users.

Mitigation Strategies

Update Mattermost to a version that fixes this issue. Based on the advisory, versions 11.9.0, 11.8.4, 11.7.7, and 10.11.22 or later should address the vulnerability.

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