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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

PUBLISHED Reserved 2026-02-24 | Published 2026-03-26 | Updated 2026-03-26 | Assigner Mattermost




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

Problem types

CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)

Product status

Default status
unaffected

11.4.0 (semver)
affected

11.3.0 (semver)
affected

11.2.0 (semver)
affected

10.11.0 (semver)
affected

11.5.0
unaffected

11.4.1
unaffected

11.3.2
unaffected

11.2.4
unaffected

10.11.12
unaffected

Credits

winfunc finder

References

mattermost.com/security-updates (MMSA-2026-00598) vendor-advisory

cve.org (CVE-2026-3114)

nvd.nist.gov (CVE-2026-3114)

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