Docmost up to 0.94.x Zip Extraction denial of service

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Docmost up to 0.94.x. This vulnerability affects unknown code of the component Zip Extraction. This manipulation causes denial of service. This vulnerability appears as CVE-2026-65827. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Docmost up to 0.94.x. Affected by this vulnerability is an unknown functionality of the component Zip Extraction. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

Docmost is open-source collaborative wiki and documentation software. From 0.21.0 until 0.95.0, any authenticated workspace member with edit rights to a space can upload an archive to the page-import feature whose ZIP extraction routine does not limit total uncompressed size, per-entry size, or entry count. The extractor writes entries to the server temp directory and automatically extracts one nested ZIP, allowing an outer upload within the default 200 MB limit to expand by multiple GB. The resulting disk exhaustion can crash the import worker and degrade or take down the instance for all tenants. This issue is fixed in version 0.95.0.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-65827 since 07/23/2026. The exploitation appears to be easy. The attack can be launched remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 0.95.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Docmost

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
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• 0.27
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• 0.48
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• 0.66
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• 0.86
• 0.87
• 0.88
• 0.89
• 0.90
• 0.91
• 0.92
• 0.93
• 0.94

Website

• Product: https://github.com/docmost/docmost/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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