CVE-2026-5755

MediumCVSS 6.5/10Last modified Jul 23, 2026

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

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

Vendor	Product	Versions
Mattermost	Mattermost	>= 11.6.0, <= 11.6.0; >= 11.5.0, <= 11.5.2; >= 11.5.0, <= 11.5.3; >= 11.4.0, <= 11.4.4; >= 10.11.0, <= 10.11.14

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: May 22, 2026
Last modified: Jul 23, 2026
NVD status: Analyzed

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