What’s Vulnerable › Vulnerabilities

CVE-2026-27625: Stirling-PDF Zip Slip: Arbitrary File Write via Path Traversal in Markdown-to-PDF ZIP Extraction

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-20 · updated 2026-06-17
• Weakness: CWE-22

Description

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 Pdf: before 2.5.2 — fixed in 2.5.2

How to fix

Upgrade to a fixed version: Stirling Pdf 2.5.2. Check the vendor advisory for mitigations.

References

• https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.5.2
• https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-wccq-mg6x-2w22

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