Security Advisory

CVE-2026-5755

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-22 10:18:49

Last updated 2026-05-22 12:15:24

Assigner Mattermost

CVSS score 6.5

State PUBLISHED

Description

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.2, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate the TIFF IFD offset in the image header before allocating memory, which allows authenticated users with file upload or posting permissions to cause a denial of service (server OOM) via uploading a crafted TIFF file or posting a URL that serves one.. Mattermost Advisory ID: MMSA-2026-00648

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