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GHSA-37j2-3vv8-cf24

Mattermost doesn't validate the TIFF IFD offset in the image header before allocating memory

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-5755

Packages

EcosystemPackageAffectedFixed in
Go github.com/mattermost/mattermost-server >= 11.6.0, < 11.6.1 11.6.1
Go github.com/mattermost/mattermost-server >= 11.5.0, < 11.5.4 11.5.4
Go github.com/mattermost/mattermost-server >= 11.4.0, < 11.4.5 11.4.5
Go github.com/mattermost/mattermost-server >= 10.11.0, < 10.11.15 10.11.15

Details

As written in the advisory (Markdown source, shown as plain text).

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

References

External links from the advisory. They lead to third-party sites.