CVE-2026-25636
8.2 · HIGHOverview
CVE-2026-25636 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 8.2 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.2, 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. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. 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-2026-25636?
CVE-2026-25636 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 8.2 (HIGH).
How severe is CVE-2026-25636?
This vulnerability has a CVSS 3.1 base score of 8.2, 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-2026-25636?
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-2026-25636?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-25636 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.
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