# CVE-2026-65827: Docmost ZIP bomb in page-import feature

Source: https://junglewise.ai/threats/cve-2026-65827-docmost-is-open-source-collaborative-wiki-and-documentation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-65827 · Severity: medium · CVSS 6.5 · Published 2026-09-24

Docmost is an open-source wiki and documentation platform. Authenticated users with edit permissions can upload specially crafted ZIP files through the page-import feature that expand to multiple gigabytes, exhausting disk space on the server. This can crash the import worker and make the service unavailable to all users on affected instances.

Technologies: [Docmost](https://junglewise.ai/threats/technologies/docmost). Vendors: [Docmost](https://junglewise.ai/threats/vendors/docmost).

## Quick answers

**Is CVE-2026-65827 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-65827 being exploited in the wild.

**How severe is CVE-2026-65827?** Medium severity, with a CVSS score of 6.5, published 24 September 2026.

**Which products and versions are affected?** Docmost 0.21.0 to 0.94.x.

**Is there a fix for CVE-2026-65827?** A patch was published on 2026-07-03: Fixed in version 0.95.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-65827 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-65827?** Check whether you run Docmost at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The page-import feature's ZIP extraction routine lacks limits on total uncompressed size, per-entry size, and entry count, and automatically extracts nested ZIPs. An attacker can craft an outer ZIP archive within the default 200 MB upload limit that decompresses to multiple GB, causing disk exhaustion. The vulnerability requires authentication and edit rights to a space.

## Affected products

- Docmost Docmost 0.21.0 to 0.94.x

## Timeline

- 2026-09-24: disclosed
- 2026-07-03: patched: Fixed in version 0.95.0

## References

- [https://github.com/docmost/docmost/commit/04110884b4e90a43cc5b337e063d0b7493be5da7](https://github.com/docmost/docmost/commit/04110884b4e90a43cc5b337e063d0b7493be5da7)
- [https://github.com/docmost/docmost/releases/tag/v0.95.0](https://github.com/docmost/docmost/releases/tag/v0.95.0)

## Related threats

- [Docmost privilege escalation in workspace invitation](https://junglewise.ai/threats/cve-2026-52853-docmost-is-open-source-collaborative-wiki-and-documentation)
- [Docmost access control bypass in transclusion API](https://junglewise.ai/threats/cve-2026-52850-docmost-is-open-source-collaborative-wiki-and-documentation)
- [Docmost authorization bypass in page export](https://junglewise.ai/threats/cve-2026-48073-docmost-is-open-source-collaborative-wiki-and-documentation)
- [Docmost path traversal in avatar and logo endpoint](https://junglewise.ai/threats/cve-2026-48072-docmost-is-open-source-collaborative-wiki-and-documentation)
- [Docmost arbitrary file deletion in avatar cleanup on local storage](https://junglewise.ai/threats/cve-2026-48070-docmost-is-open-source-collaborative-wiki-and-documentation)