How severe is CVE-2026-33205?

CVE-2026-33205 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-33205 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33205?

CVE-2026-33205 affects Calibre-ebook Calibre. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33205?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33205 have an EU (EUVD) identifier?

Yes. CVE-2026-33205 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16610.

When was CVE-2026-33205 published?

CVE-2026-33205 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-33205

CVE-2026-33205 is a medium-severity vulnerability in Calibre-ebook Calibre with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v4: 4.8
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16610
Weakness: CWE-918
Affected product: Calibre-ebook Calibre
Published: 2026-03-27
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-33205?: 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.
How severe is CVE-2026-33205?: CVE-2026-33205 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-33205 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33205?: CVE-2026-33205 affects Calibre-ebook Calibre. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33205?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33205 have an EU (EUVD) identifier?: Yes. CVE-2026-33205 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16610.
When was CVE-2026-33205 published?: CVE-2026-33205 was published on 2026-03-27 and last updated on 2026-06-17.

References

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4926-v9px-wv7v

Affected products (1)

cpe:2.3:a:calibre-ebook:calibre:*:*:*:*:*:*:*:*

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