CVE-2026-25635

EUVD-2026-5596
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.
Path Traversal
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.6 HIGH
LOCAL
LOW
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
GitHub_MCNA
8.6 HIGH
LOCAL
LOW
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 39%
Affected Products (NVD)
VendorProductVersion
calibre-ebookcalibre
𝑥
< 9.2.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
calibre
bookworm
no-dsa
bullseye
postponed
bullseye (security)
vulnerable
forky
vulnerable
sid
9.3.0+ds+~0.10.5-1
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
calibre
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxr
https://0x5t.raptx.org/posts/calibre-chm-rce