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All three transports concatenated header names and values into the request as "$name: $value" without validation, so a value containing a line break added further headers to the request. Applications that put user input into a header were open to header injection and request splitting. Validate the names against the token grammar and reject values, including the user agent, that contain CR, LF or NUL with an InvalidArgumentException. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This was referenced Nov 12, 2026
Hackwar
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