CVE-2026-3114— Zip Bomb Denial of Service via Unrestricted Archive Decompression
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same vendor: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same weakness: CWE-409
- CVE-2026-27460
Tandoor Recipes Affected by Denial of Service via Recipe Imp - CVE-2026-40148
PraisonAI Affected by Decompression Bomb DoS via Recipe Bund - CVE-2026-39373
JWCrypto: JWE ZIP decompression bomb - CVE-2026-32044
OpenClaw < 2026.3.2 - Tar Archive Safety Bypass in Skills In - CVE-2026-2575
Keycloak: keycloak: denial of service due to excessive samlr
V. Comments for CVE-2026-3114
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