CVE-2026-5755 — Denial of service via crafted TIFF file upload

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 11.6.0 through 11.6.0; affected 11.5.0 through 11.5.2; affected 11.5.0 through 11.5.3; affected 11.4.0 through 11.4.4; affected 10.11.0 through 10.11.14; unaffected 11.7.0; unaffected 11.6.1; unaffected 11.5.3; unaffected 11.5.4; unaffected 11.4.5; unaffected 10.11.15

CWE

CWE-400

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.