calibre: calibre is an e-book manager
CVE-2026-25636 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-25636, released February 6, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| calibre · Debian 12.15 (bookworm) | 6.13.0+repack-2+deb12u6 | DEBIAN-CVE-2026-25636 | Feb 6, 2026 |
| calibre · Debian 13.5 (trixie) | 8.5.0+ds-1+deb13u2 | DEBIAN-CVE-2026-25636 | Feb 6, 2026 |
| calibre · Debian 14 | 9.2.0+ds+~0.10.5-1 | DEBIAN-CVE-2026-25636 | Feb 6, 2026 |
| calibre · Fedora 43 | 9.13.0-1.fc43 | FEDORA-2026-C10ED2F3B7 | Aug 16, 2026 |
| calibre-debuginfo · Fedora 43 | 9.13.0-1.fc43 | FEDORA-2026-C10ED2F3B7 | Aug 16, 2026 |
| calibre-debugsource · Fedora 43 | 9.13.0-1.fc43 | FEDORA-2026-C10ED2F3B7 | Aug 16, 2026 |
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