CVE-2026-25635
8.6 · HIGHOverview
CVE-2026-25635 is a high-severity vulnerability affecting calibre-ebook calibre. It was published on February 6, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical Description
calibre is an e-book manager. Prior to 9.2.0, Calibre's CHM reader contains a path traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows (haven't tested on other OS's), this can lead to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. This vulnerability is fixed in 9.2.0.
Remediation
Check the references section for vendor advisories and patches from calibre-ebook. Update calibre to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| calibre-ebook | calibre | >= 0, < 9.2.0 | Affected |
Frequently Asked Questions
What is CVE-2026-25635?
CVE-2026-25635 is a high-severity vulnerability affecting calibre-ebook calibre. It was published on February 6, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).
How severe is CVE-2026-25635?
This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-25635?
Check the references section for vendor advisories and patches from calibre-ebook. Update calibre to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-25635?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-25635 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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