Severity:
HIGH RISK
(7.5)
Improper Input Validation in Koa ctx.hostname API
CVE-2026-27959
Modified
Vulnerability Type
Category:
Improper Input Validation
CWE:
CWE-20
Impact:
Host Header Injection leading to spoofed URLs, poisoned links, and security control bypass
Severity:
HIGH RISK
(7.5)
CVSS Version:
3.1
Catch This CVE While Code Is Being Written
Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.
Summary
Affected Context
Exploit Preconditions
Why This Happens
Potential Impact
General Mitigation Guidance
How Teams Detect Issues Like This
Frequently Asked Questions
Source
NDV
[FAQ]
Frequently Asked
Questions
What is Framer?
What is Framer?
What is Framer?
What is Framer?
What is Framer?
What is Framer?
What is Framer?
[GET STARTED]
START PENTEST
NO CC REQUIRED
