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CVE-2026-14298— Boards archive import endpoint allows resource exhaustion via zip bomb and file size limit bypass in Mattermost

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公司开源的一个开源协作平台。 Mattermost 11.9.0及之前的11.9.x版本、11.8.4及之前的11.8.x版本、11.7.7及之前的11.7.x版本和10.11.22及之前的10.11.x版本存在资源管理错误漏洞，该漏洞源于处理某些用户提供的输入时未正确限制资源消耗，可能导致已认证用户造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 9

VendorProduct Version RangeStatus
Mattermost Mattermost 11.9.0≤ 11.9.0 affected
11.8.0≤ 11.8.4 affected
11.7.0≤ 11.7.7 affected
10.11.0≤ 10.11.22 affected
11.10.0 unaffected
11.9.1 unaffected
11.8.5 unaffected
11.7.8 unaffected
… +1 more rows
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I. Basic Information for CVE-2026-14298

Vulnerability Information
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Vulnerability Title
Boards archive import endpoint allows resource exhaustion via zip bomb and file size limit bypass in Mattermost
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to limit decompressed content size and enforce the configured maximum file size in the Boards archive import handler, which allows an authenticated user to cause memory exhaustion or unbounded disk consumption via a crafted .boardarchive file uploaded to the import endpoint.. Mattermost Advisory ID: MMSA-2026-00713
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 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司开源的一个开源协作平台。 Mattermost 11.9.0及之前的11.9.x版本、11.8.4及之前的11.8.x版本、11.7.7及之前的11.7.x版本和10.11.22及之前的10.11.x版本存在资源管理错误漏洞，该漏洞源于处理某些用户提供的输入时未正确限制资源消耗，可能导致已认证用户造成拒绝服务。
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 11.9.0 ~ 11.9.0 -

II. Public POCs for CVE-2026-14298

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III. Intelligence Information for CVE-2026-14298

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IV. Related Vulnerabilities

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

V. Comments for CVE-2026-14298

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