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Vulnerability details: VCID-2w1b-b6qm-4qhf
Vulnerability ID VCID-2w1b-b6qm-4qhf
Aliases CVE-2026-33205
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 4.3
Risk 2.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-918 Server-Side Request Forgery (SSRF)
System Score Found at
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-33205
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-33205
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-33205
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-33205
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-33205
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-33205
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-33205
cvssv4 4.8 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4926-v9px-wv7v
ssvc Track https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4926-v9px-wv7v
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-33205
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33205
GHSA-4926-v9px-wv7v https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4926-v9px-wv7v
No exploits are available.
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Found at https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4926-v9px-wv7v
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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none

present

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passive

active

high

low

none

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low

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low

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low

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low

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low

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-27T18:57:50Z/ Found at https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4926-v9px-wv7v
Exploit Prediction Scoring System (EPSS)
Percentile 0.02154
EPSS Score 0.00013
Published At April 8, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T16:39:30.458220+00:00 Debian Oval Importer Import https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2 38.0.0