XML
application/xml
Magic Bytes
Offset: 0
3C 3F 78 6D 6C
Extensible Markup Language (XML) is a text-based data format defined by the World Wide Web Consortium (W3C) to ensure human-readable and machine-readable documentation. It serves as a standard for web services, configuration files, and cross-platform data exchange between disparate software systems. Although generally safe, XML parsers may be vulnerable to external entity injection (XXE) attacks, which can lead to unauthorized data access or denial-of-service conditions if input is not properly sanitized.
Validation Code
How to validate .xml files in Python
Python
def is_xml(file_path: str) -> bool:
"""Check if file is a valid XML by magic bytes."""
signature = bytes([0x3C, 0x3F, 0x78, 0x6D, 0x6C])
with open(file_path, "rb") as f:
return f.read(5) == signatureHow to validate .xml files in Node.js
Node.js
function isXML(buffer: Buffer): boolean {
const signature = Buffer.from([0x3C, 0x3F, 0x78, 0x6D, 0x6C]);
return buffer.subarray(0, 5).equals(signature);
}
Go
func IsXML(data []byte) bool {
signature := []byte{0x3C, 0x3F, 0x78, 0x6D, 0x6C}
if len(data) < 5 {
return false
}
return bytes.Equal(data[:5], signature)
}API Endpoint
GET
/api/v1/xml
curl https://filesignature.org/api/v1/xml