Mattermost doesn't validate decompressed archive entry sizes during file extraction
GHSA-vhgh-g7x8-4rx8 · CVE-2026-3114 · GO-2026-5663
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Description
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip archives containing highly compressed entries (zip bombs) that exhaust server memory. Mattermost Advisory ID: MMSA-2026-00598.
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