CVE-2026-5755
Analyzed
Analyzed - Analysis Complete
BaseFortify
Publication date: 2026-05-22
Last updated on: 2026-05-22
Assigner: Mattermost, Inc.
Description
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
CVSS Scores
EPSS Scores
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| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mattermost | mattermost_server | From 10.11.0 (inc) to 10.11.15 (exc) |
| mattermost | mattermost_server | From 11.4.0 (inc) to 11.4.5 (exc) |
| mattermost | mattermost_server | From 11.5.0 (inc) to 11.5.3 (exc) |
| mattermost | mattermost_server | From 11.6.0 (inc) to 11.6.1 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-400 | The product does not properly control the allocation and maintenance of a limited resource. |
Attack-Flow Graph
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