What’s Vulnerable › Vulnerabilities

CVE-2026-65827: Docmost: Unbounded ZIP decompression (zip-bomb) in page import allows denial of service

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-09-24
• Weakness: CWE-400

Description

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.

Affected products

• docmost: from 0.21.0, < 0.95.0

References

• https://github.com/docmost/docmost/commit/04110884b4e90a43cc5b337e063d0b7493be5da7
• https://github.com/docmost/docmost/releases/tag/v0.95.0
• https://github.com/docmost/docmost/security/advisories/GHSA-frjw-66gr-799m

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