Quick answers
- Is CVE-2026-93850 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93850 being exploited in the wild.
- How severe is CVE-2026-93850?
- Medium severity, with a CVSS score of 6.5, published 26 October 2026.
- Which products and versions are affected?
- Mattermost Server 11.7.x through 11.7.10, 11.8.x through 11.8.5, 11.9.x through 11.9.1, 11.10.x through 11.10.1.
- Is there a fix for CVE-2026-93850?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-93850 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-93850?
- Check whether you run Mattermost Server 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 vulnerability exists in the PDF text extraction component which fails to properly bound memory allocation when decompressing PDF content streams. An authenticated attacker can upload a maliciously crafted PDF with highly compressed content that expands to a very large amount of text, causing server memory exhaustion and denial of service. Exploitation requires authentication and user interaction (file upload) but no network access beyond the application itself.
Affected products
- Mattermost Mattermost Server 11.7.x through 11.7.10, 11.8.x through 11.8.5, 11.9.x through 11.9.1, 11.10.x through 11.10.1
Timeline
- 2026-10-26: disclosed