4.x - Strip CRLF from message headers in SmtpTransport - #19513
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Strip CRLF bytes from message headers when delivering mail by SmtpTransport. This prevents header injection should userland code supply user data into messages headers. Thank you to Himanshu Anand for reporting this issue.
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Jul 15, 2026
* Strip CRLF from message headers in SmtpTransport Strip CRLF bytes from message headers when delivering mail by SmtpTransport. This prevents header injection should userland code supply user data into messages headers. Thank you to Himanshu Anand for reporting this issue. * Fix failing test from previous fix * Fix php incompatibility.
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Strip CRLF bytes from message headers when delivering mail by SmtpTransport. This prevents header injection should userland code supply user data into messages headers.
Thank you to Himanshu Anand for reporting this issue.
Backport of #19512 to 4.x