Vulnerability · Published Feb 6, 2026 · Assigned by GitHub_M
CVE-2026-25635calibre has a Path Traversal Leading to Arbitrary File Write and Potential Code Execution
High 8.6
In plain English
A high-severity path traversal in calibre from kovidgoyal. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | calibre | 6.13.0+repack-2+deb12u6 | DEBIAN-CVE-2026-25635 |
| Debian:13 | calibre | 8.5.0+ds-1+deb13u2 | DEBIAN-CVE-2026-25635 |
| Debian:14 | calibre | 9.2.0+ds+~0.10.5-1 | DEBIAN-CVE-2026-25635 |
| Ubuntu:22.04:LTS | calibre | no fix listed | UBUNTU-CVE-2026-25635 |
| Ubuntu:24.04:LTS | calibre | no fix listed | UBUNTU-CVE-2026-25635 |
| Ubuntu:25.10 | calibre | no fix listed | UBUNTU-CVE-2026-25635 |
| Ubuntu:26.04:LTS | calibre | no fix listed | UBUNTU-CVE-2026-25635 |
| Ubuntu:26.10 | calibre | no fix listed | UBUNTU-CVE-2026-25635 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| kovidgoyal | calibre | < 9.2.0 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H