CVE-2026-30853
calibre has a Path Traversal Leading to Arbitrary File Write
Reported by github_m · Published March 13, 2026
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability in the RocketBook (.rb) input plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to write arbitrary files to any path writable by the calibre process when a user opens or converts a crafted .rb file. This is the same bug class fixed in CVE-2026-26065 for the PDB readers, but the fix was never applied to the RB reader. This vulnerability is fixed in 9.5.0.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| calibre | calibre-ebook | 9.5.0 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| kovidgoyal | calibre | < 9.5.0 |
| kovidgoyal | calibre | 0 |
Timeline
- Mar 13, 2026 CVE Published
- Mar 13, 2026 CVE Updated
- Mar 14, 2026 EPSS Score (30 in total, the first dated here)
- Mar 17, 2026 Coalition ESS Score (2 in total, the first dated here)
- Oct 8, 2026 Security Advisory
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References
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542x x_refsource_CONFIRM