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Vulnerability details: VCID-hgmk-8s7s-tfdb
Vulnerability ID VCID-hgmk-8s7s-tfdb
Aliases CVE-2026-27810
Summary calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.4.0, an HTTP Response Header Injection vulnerability in the calibre Content Server allows any authenticated user to inject arbitrary HTTP headers into server responses via an unsanitized `content_disposition` query parameter in the `/get/` and `/data-files/get/` endpoints. All users running the calibre Content Server with authentication enabled are affected. The vulnerability is exploitable by any authenticated user and can also be triggered by tricking an authenticated victim into clicking a crafted link. Version 9.4.0 contains a fix for the issue.
Status Published
Exploitability 0.5
Weighted Severity 5.8
Risk 2.9
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
System Score Found at
epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2026-27810
epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2026-27810
epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2026-27810
epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2026-27810
epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2026-27810
epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2026-27810
epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2026-27810
epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2026-27810
epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2026-27810
cvssv3.1 6.4 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw
ssvc Track https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-27810
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-27810
GHSA-5fpj-fxw7-8grw https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Found at https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-02T12:53:21Z/ Found at https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw
Exploit Prediction Scoring System (EPSS)
Percentile 0.16461
EPSS Score 0.00052
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T16:39:27.465312+00:00 Debian Oval Importer Import https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2 38.0.0