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CVE-2026-3114— Zip Bomb Denial of Service via Unrestricted Archive Decompression

Quick assessment

Affected
Mattermost Mattermost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost存在安全漏洞，该漏洞源于在文件提取期间未验证解压缩存档条目大小，可能导致经过身份验证的用户通过特制zip档案造成拒绝服务。以下版本受到影响：11.4.0及之前的11.4.x版本、11.3.1及之前的11.3.x版本、11.2.3及之前的11.2.x版本和10.11.11及之前的10.11.x版本。

CVSS 6.5 · Medium EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-3114

Vulnerability Information
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Vulnerability Title
Zip Bomb Denial of Service via Unrestricted Archive Decompression
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost存在安全漏洞，该漏洞源于在文件提取期间未验证解压缩存档条目大小，可能导致经过身份验证的用户通过特制zip档案造成拒绝服务。以下版本受到影响：11.4.0及之前的11.4.x版本、11.3.1及之前的11.3.x版本、11.2.3及之前的11.2.x版本和10.11.11及之前的10.11.x版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost 11.4.0 ~ 11.4.0 -

II. Public POCs for CVE-2026-3114

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III. Intelligence Information for CVE-2026-3114

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Same Patch Batch · Mattermost · 2026-03-26 · 8 CVEs total

CVE-2026-3108 8.0 HIGH Terminal Escape Injection in mmctl Report Posts Command
CVE-2026-3112 6.8 MEDIUM Arbitrary File Read via Advanced Logging Support Packet
CVE-2026-4274 5.4 MEDIUM Insufficient authorization in shared channel membership sync grants team-level access inst
CVE-2026-3113 5.0 MEDIUM mmctl export download command doesn’t restrict permissions to created file to file owner
CVE-2026-3116 4.9 MEDIUM Improper Input Validation in Zoom Plugin Webhook Handler
CVE-2026-3115 4.3 MEDIUM Guest users can view group member IDs without respecting view restrictions
CVE-2026-3109 2.2 LOW Missing timestamp validation in Zoom webhook handler

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-409

V. Comments for CVE-2026-3114

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