CVE-2026-26246
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Memory Exhaustion via PSD Processing in Mattermost Server

Publication date: 2026-03-16

Last updated on: 2026-03-18

Assigner: Mattermost, Inc.

Description
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to bound memory allocation when processing PSD image files which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted PSD file. Mattermost Advisory ID: MMSA-2026-00572

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Meta Information

Published
2026-03-16
Last Modified
2026-03-18
Generated
2026-07-06
AI Q&A
2026-03-16
EPSS Evaluated
2026-07-05
NVD
CVE-2026-26246
EUVD
EUVD-2026-12417

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mattermost mattermost_server From 10.11.0 (inc) to 10.11.11 (exc)
mattermost mattermost_server From 11.2.0 (inc) to 11.2.3 (exc)
mattermost mattermost_server From 11.3.0 (inc) to 11.3.1 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-789 The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

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Executive Summary

This vulnerability exists in Mattermost versions 11.3.0 and earlier in the 11.3.x series, 11.2.2 and earlier in the 11.2.x series, and 10.11.10 and earlier in the 10.11.x series. It occurs because the software fails to properly limit memory allocation when processing PSD image files.

An authenticated attacker can exploit this by uploading a specially crafted PSD file, which causes the server to exhaust its memory resources.

This leads to a denial of service condition on the server.

Impact Analysis

The primary impact of this vulnerability is a denial of service (DoS) on the Mattermost server.

By uploading a specially crafted PSD file, an authenticated attacker can cause the server to consume excessive memory, potentially leading to server crashes or unavailability.

Compliance Impact

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