CVE-2026-33206: calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books

Q: How do I fix CVE-2026-33206?

calibre: upgrade to 9.6.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33206 being exploited?

CVE-2026-33206 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33206 affect?

CVE-2026-33206 affects calibre. Severity is medium (CVSS 6.3). calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.6.0, a path traversal vulnerability exists in Calibre' handling of images in Markdown and other similar text-based files

Q: How urgent is CVE-2026-33206?

Priority 30/100. Public exploit reference

Routine

MEDIUM 6.3UPGRADE

CVE-2026-33206 is a medium-severity flaw (CVSS 6.3) affecting calibre. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.6.0, a path traversal vulnerability exists in Calibre' handling of images in Markdown and other similar text-based files allowing an attacker to include arbitrary files from the file system into the converted book. Additionally, missing authentication and server-side request forgery in the background-image endpoint in the ebook

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-23
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: calibre-ebook

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 15:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

calibre-ebook calibre UPGRADE

Affected: < 9.6.0

Fixed in: 9.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy calibre || rpm -q calibre || calibre --version

2. UPGRADE to 9.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade calibre

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade calibre

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33206?

calibre: upgrade to 9.6.0. Exact commands for each OS are on this page.

Is CVE-2026-33206 being exploited?

CVE-2026-33206 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33206 affect?

CVE-2026-33206 affects calibre. Severity is medium (CVSS 6.3). calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.6.0, a path traversal vulnerability exists in Calibre' handling of images in Markdown and other similar text-based files

How urgent is CVE-2026-33206?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2026-33205 MEDIUM 5.5 UPGRADE calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books

References

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