HTTP Request Smuggling

slim/psr7 is vulnerable to Insecure Header Validation. The vulnerability exists in the validateHeaderName function in Headers.php, which allows an attacker to sneak in a newline \n into header names and values, potentially resulting in HTTP cache poisoning or phishing attacks...

CVE-2023-30536 Insecure header validation in slim/psr7

slim/psr7 is a PSR-7 implementation for use with Slim 4. In versions prior to 1.6.1 an attacker could sneak in a newline \n into both the header names and values. While the specification states that \r\n\r\n is used to terminate the header list, many servers in the wild will also accept \n\n. An...