Bug 2443412 (CVE-2026-27810)

Summary: CVE-2026-27810 calibre: Calibre: HTTP Response Header Injection via unsanitized query parameter
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in calibre, an e-book manager. An authenticated user can exploit an HTTP Response Header Injection vulnerability in the calibre Content Server. This is due to an unsanitized `content_disposition` query parameter in specific endpoints, allowing the injection of arbitrary HTTP headers into server responses. This could lead to information disclosure or other impacts by manipulating server behavior.
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Bug Depends On: 2443781    
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Description OSIDB Bzimport 2026-02-27 20:01:28 UTC
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.