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CVE-2026-27810— calibre Vulnerable to HTTP Response Header Injection

Quick assessment

Affected
kovidgoyal calibre
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Calibre是印度Kovid Goyal个人开发者的一个开源免费的全能电子书阅读管理与格式转换工具。 Calibre 9.4.0之前版本存在注入漏洞，该漏洞源于内容服务器存在HTTP响应标头注入漏洞，可能导致任何经过身份验证的用户通过未清理的content_disposition查询参数注入任意HTTP标头。

CVSS 6.4 · Medium EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-27810

Vulnerability Information
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Vulnerability Title
calibre Vulnerable to HTTP Response Header Injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5
Vulnerability Title
Calibre 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Calibre是印度Kovid Goyal个人开发者的一个开源免费的全能电子书阅读管理与格式转换工具。 Calibre 9.4.0之前版本存在注入漏洞，该漏洞源于内容服务器存在HTTP响应标头注入漏洞，可能导致任何经过身份验证的用户通过未清理的content_disposition查询参数注入任意HTTP标头。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kovidgoyal calibre < 9.4.0 -

II. Public POCs for CVE-2026-27810

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III. Intelligence Information for CVE-2026-27810

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Vendor Advisories for CVE-2026-27810 (1)

IV. Related Vulnerabilities

Same product: calibre
Same vendor: kovidgoyal
Same weakness: CWE-113

V. Comments for CVE-2026-27810

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