CVE-2026-3114

Zip Bomb Denial of Service via Unrestricted Archive Decompression

State: Published
Severity: 6.5 Medium
Published: Mar 26, 2026
Updated: Mar 26, 2026
Reserved: Feb 24, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	Mattermost

Weaknesses

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

Affected Products

Product	Versions
MattermostMattermost	11.4.0 through 11.4.0Affected 11.3.0 through 11.3.1Affected 11.2.0 through 11.2.3Affected 10.11.0 through 10.11.11Affected 11.5.0Not affected 11.4.1Not affected 11.3.2Not affected 11.2.4Not affected 10.11.12Not affected

References

MMSA-2026-00598vendor-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.