CVE Tools
Sign in

CVE-2026-27810

calibre Vulnerable to HTTP Response Header Injection

Published: Feb 27, 2026Updated: Mar 4, 2026 Sources: CVE List NVDCWE-113
NVD MITRE
6.4CVSSMEDIUM
EPSS Score
0.2%
Top 89.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-113

Affected Products

calibrecalibre-ebook
On-prem
Consumer Software / productivity
calibrekovidgoyal
On-prem
Consumer Software / productivity
calibre-ebookoss-projectConsumer Softwareaka calibre
kovidgoyalindividual-devConsumer Softwareaka calibre, kitty

Exploitability

Workaround Available

References

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw
github.com

Timeline

Published
Feb 27, 2026
Last Updated
Mar 4, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-27810 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows