CVE-2026-25635
published 2026-02-06CVE-2026-25635: 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…
PriorityP348high8.6CVSS 3.1
AVLACLPRNUIRSCCHIHAH
EPSS
0.44%
35.0th percentile
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
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| calibre-ebook | calibre | < 9.2.0 | 9.2.0 |
| debian | calibre | < calibre 9.2.0+ds+~0.10.5-1 (forky) | calibre 9.2.0+ds+~0.10.5-1 (forky) |
| kovidgoyal | calibre | < 9.2.0 | 9.2.0 |
| kovidgoyal | calibre | >= 0 < 9.2.0+ds+~0.10.5-1 | 9.2.0+ds+~0.10.5-1 |
CVSS provenance
nvdv3.18.6HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
osv8.6HIGH
vendor_debian8.6HIGH
vendor_redhat8.6HIGH
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
OSV
CVE-2026-25635: calibre is an e-book manager
osv·2026-02-06·CVSS 8.6
CVE-2026-25635 [HIGH] CVE-2026-25635: calibre is an e-book manager
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.
Red Hat
calibre: Calibre: Remote Code Execution via path traversal in CHM reader
vendor_redhat·2026-02-06·CVSS 8.6
CVE-2026-25635 [HIGH] calibre: Calibre: Remote Code Execution via path traversal in CHM reader
calibre: Calibre: Remote Code Execution via path traversal in CHM reader
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.
A flaw was found in Calibre's CHM reader. This path traversal vulnerability allows an attacker to write arbitrary files to locations where the user has write permissions. On Windows systems, this could lead to remote code execution by placing a malicious file in the Startup folder, which would then execute upon the user's next login. This vulnerab
Debian
CVE-2026-25635: calibre - calibre is an e-book manager. Prior to 9.2.0, Calibre's CHM reader contains a pa...
vendor_debian·2026·CVSS 8.6
CVE-2026-25635 [HIGH] CVE-2026-25635: calibre - calibre is an e-book manager. Prior to 9.2.0, Calibre's CHM reader contains a pa...
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.
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 9.2.0+ds+~0.10.5-1)
sid: resolved (fixed in 9.2.0+ds+~0.10.5-1)
trixie: open
No detection rules found.
No public exploits indexed.
Wiz
CVE-2026-25635 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.6
CVE-2026-25635 [HIGH] CVE-2026-25635 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-25635 :
NixOS vulnerability analysis and mitigation
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.
Source : NVD
## 8.6
Score
Published February 6, 2026
Severity HIGH
CNA Score 8.6
Affected Technologies
NixOS
Homebrew
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 24
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
cpe:2.3:a:ca
Bugzilla
CVE-2026-25635 calibre: Calibre: Remote Code Execution via path traversal in CHM reader [fedora-42]
bugzilla·2026-02-09·CVSS 8.6
CVE-2026-25635 [HIGH] CVE-2026-25635 calibre: Calibre: Remote Code Execution via path traversal in CHM reader [fedora-42]
CVE-2026-25635 calibre: Calibre: Remote Code Execution via path traversal in CHM reader [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained versio
2026-02-06
Published