CVE-2026-3114

CWE-4095 documents5 sources
Severity
6.5MEDIUM
EPSS
0.0%
top 88.55%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Github.com Mattermost/mattermost/server/v8Mattermost Mattermost ServerMattermost Mattermost
Timeline
PublishedMar 26

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages3 packages

▶NVDmattermost/mattermost_server10.11.0 — 10.11.12+3
▶CVEListV5mattermost/mattermost11.4.0 — 11.4.0+3

🔴Vulnerability Details

3
CVEList
Zip Bomb Denial of Service via Unrestricted Archive Decompression↗2026-03-26
▶
GHSA
Mattermost doesn't validate decompressed archive entry sizes during file extraction↗2026-03-26
▶
OSV
Mattermost doesn't validate decompressed archive entry sizes during file extraction↗2026-03-26
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-3114 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-3114 (MEDIUM CVSS 6.5) | Mattermost versions 11.4.x <= 11.4. | cvebase.io