Calibre
CVE-2026-27810
MEDIUM
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
HTTP response header injection in Calibre Content Server prior to version 9.4.0 permits authenticated users to inject arbitrary headers through an unsanitized query parameter, potentially enabling cache poisoning, session fixation, or credential theft attacks. Any authenticated user can exploit this vulnerability directly or via social engineering, affecting all instances with authentication enabled. Public exploit code exists and no patch is currently available.
Technical ContextAI
Classified as CWE-113 (HTTP Response Splitting). Affects Calibre. 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 i
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
Remote code execution in Calibre 9.2.1 and earlier allows authenticated users to write arbitrary files via a path traver
Calibre versions 9.2.1 and below allow authenticated users to write arbitrary files with any extension to any writable l
Remote code execution in Calibre prior to version 9.2.0 through a path traversal flaw in the CHM reader allows local att
Calibre 9.1.0 and earlier contains a path traversal vulnerability in EPUB conversion that allows malicious EPUB files to
calibre is an e-book manager. [CVSS 7.8 HIGH]
gui2/viewer/bookmarkmanager.py in Calibre 3.18 calls cPickle.load on imported bookmark data, which allows remote attacke
Path traversal in Calibre <= 7.14.0 allow unauthenticated attackers to achieve arbitrary file read. Rated high severity
link_to_local_path in ebooks/conversion/plugins/html_input.py in calibre before 6.19.0 can, by default, add resources ou
calibre before 5.32.0 contains a regular expression that is vulnerable to ReDoS (Regular Expression Denial of Service) i
Unsanitized user-input in Calibre <= 7.15.0 allow users with permissions to perform full-text searches to achieve SQL in
Unsanitized user-input in Calibre <= 7.15.0 allow attackers to perform reflected cross-site scripting. Rated medium seve
The E-book viewer in calibre before 2.75 allows remote attackers to read arbitrary files via a crafted epub file with Ja
Same weakness CWE-113 – HTTP Response Splitting
View allSame technique Code Injection
View allVendor StatusVendor
SUSE
Severity: MediumShare
External POC / Exploit Code
Leaving vuln.today