CVE-2026-25635
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.6 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- EPSS
- 0.46% probability · 38th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- calibre-ebook/calibre
- Source
- security-advisories@github.com
References
- https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9Patch
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxrExploit, Third Party Advisory
- https://0x5t.raptx.org/posts/calibre-chm-rceExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.