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.
History

Wed, 04 Mar 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Calibre-ebook
Calibre-ebook calibre
CPEs cpe:2.3:a:calibre-ebook:calibre:*:*:*:*:*:*:*:*
Vendors & Products Calibre-ebook
Calibre-ebook calibre

Mon, 02 Mar 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 02 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Kovidgoyal
Kovidgoyal calibre
Vendors & Products Kovidgoyal
Kovidgoyal calibre

Fri, 27 Feb 2026 20:00:00 +0000

Type Values Removed Values Added
Description 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.
Title calibre Vulnerable to HTTP Response Header Injection
Weaknesses CWE-113
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-02-27T19:44:39.106Z

Updated: 2026-03-02T12:53:36.368Z

Reserved: 2026-02-24T02:31:33.267Z

Link: CVE-2026-27810

cve-icon Vulnrichment

Updated: 2026-03-02T12:53:32.292Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-27T20:21:39.780

Modified: 2026-03-04T16:40:42.740

Link: CVE-2026-27810

cve-icon Redhat

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