CVE-2026-27625: Stirling PDF

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Stirling-PDF is a locally hosted web application that performs various operations on PDF files. In versions prior to 2.5.2, the /api/v1/convert/markdown/pdf endpoint extracts user-supplied ZIP entries without path checks. Any authenticated user can write files outside the intended temporary working directory, leading to arbitrary file write with the privileges of the Stirling-PDF process user (stirlingpdfuser). This can overwrite writable files and compromise data integrity, with further impact depending on writable paths. The issue was fixed in version 2.5.2.

Affected products

• Stirling Stirling PDF: before 2.5.2 (fixed in 2.5.2)

Published 2026-03-20. Last modified 2026-06-17.