CVE-2026-27810: medium-severity vulnerability in kovidgoyal calibre
calibre Vulnerable to HTTP Response Header Injection
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.4epss 0.2%
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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Affected products
kovidgoyal · calibreRelated CVEs — kovidgoyal calibre
In the same product, most dangerous first.
CVE-2026-26064CRITICALcalibre: Path Traversal Vulnerability Enables Arbitrary File Write and Remote Code ExecutionEPSS 1.0%CVE-2026-26065CRITICALcalibre: Path Traversal can Lead to Arbitrary File Write and Potential Code ExecutionEPSS 0.6%CVE-2026-25635HIGHcalibre has a Path Traversal Leading to Arbitrary File Write and Potential Code ExecutionEPSS 0.5%CVE-2026-73249HIGHcalibre Content Server `/book-update-annotations` Missing Write Authorization Check Allows Unauthorized Annotation ModificationEPSS 0.4%CVE-2026-25731HIGHCalibre Affected by Arbitrary Code Execution via Server-Side Template Injection in Calibre HTML ExportEPSS 0.3%CVE-2026-25636HIGHcalibre has a Path Traversal Leading to Arbitrary File Corruption and Code ExecutionEPSS 0.2%