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Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')


Severity Medium
Score 5.4/10


Undici is an HTTP/1.1 client for Node.js. In versions 2.0.0 through 5.19.0, the undici library does not protect "host" HTTP header from CRLF injection vulnerabilities. As a workaround, sanitize the "" string before passing to undici.

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CWE-74 - Injection

Listed as the number one web application security risk on the 'OWASP Top Ten', injection attacks are widespread and dangerous, especially in legacy applications. Injection attacks are a class of vulnerabilities in which an attacker injects untrusted data into a web application that gets processed by an interpreter, altering the program's execution. This can result in data loss/theft, loss of data integrity, denial of service, and even compromising the entire system.

Advisory Timeline

  • Published