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

Q: How do I fix CVE-2026-33205?

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

Q: Is CVE-2026-33205 being exploited?

CVE-2026-33205 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-2026-33205 affect?

CVE-2026-33205 affects calibre. Severity is medium (CVSS 5.5). calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.6.0, a Server-Side Request Forgery vulnerability in the background-image endpoint of calibre e-book reader's web view al

Q: How urgent is CVE-2026-33205?

Priority 26/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2026-33205 is a medium-severity flaw (CVSS 5.5) 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 Server-Side Request Forgery vulnerability in the background-image endpoint of calibre e-book reader's web view allows an attacker to perform blind GET requests to arbitrary URLs and exfiltrate information out from the ebook sandbox. Version 9.6.0 patches the issue.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-918
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-2026-33205?

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

Is CVE-2026-33205 being exploited?

CVE-2026-33205 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-2026-33205 affect?

CVE-2026-33205 affects calibre. Severity is medium (CVSS 5.5). calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.6.0, a Server-Side Request Forgery vulnerability in the background-image endpoint of calibre e-book reader's web view al

How urgent is CVE-2026-33205?

Priority 26/100. Public exploit reference

Related CVEs

CVE-2026-33206 MEDIUM 6.3 UPGRADE calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books

References

← Back to latest CVEs