HTTP Response Splitting Affecting calibre package, versions <9.4.0+ds+~0.10.5-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.21% (11th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-CALIBRE-15363628
  • published28 Feb 2026
  • disclosed27 Feb 2026

Introduced: 27 Feb 2026

CVE-2026-27810  (opens in a new tab)
CWE-113  (opens in a new tab)

How to fix?

Upgrade Debian:unstable calibre to version 9.4.0+ds+~0.10.5-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream calibre package and not the calibre package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1