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Description
BusyBox wget thru 1.3.7 accepted raw CR (0x0D)/LF (0x0A) and other C0 control bytes in the HTTP request-target (path/query), allowing the request line to be split and attacker-controlled headers to be injected. To preserve the HTTP/1.1 request-line shape METHOD SP request-target SP HTTP/1.1, a raw space (0x20) in the request-target must also be rejected (clients should use %20).
References
lists.busybox.net/...s/20250823/ccdc96ef/attachment-0001.htm
lists.busybox.net/...hments/20250828/e7f90492/attachment.htm
gist.github.com/subyumatest/41554af6a72aedaacaec026adc311092