CVE-2026-65827 Docmost: Unbounded ZIP decompression (zip-bomb) in page import allows denial of service
Authenticated users can cause denial of service by uploading malicious ZIP files that exhaust server disk space during import.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-65827?
CVE-2026-65827 is a medium-severity denial of service vulnerability in docmost, published on 24 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-65827?
How do I fix CVE-2026-65827?
No fix has been published for CVE-2026-65827 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-65827 being exploited?
There is no known exploitation of CVE-2026-65827 in the wild and no public exploit code.
Sources
Also known as GHSA-frjw-66gr-799m.