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curl: FTP entrypath accepts 0xFF (Telnet IAC) through incomplete ISCNTRL filter, sent on wire via CWD on connection reuse

🗓️ 05 Apr 2026 06:46:27Reported by mzfrType 
hackerone
 hackerone🔗 hackerone.com👁 11 Views

A malicious file transfer server can embed 0xFF in the PWD path and send it via CWD on connection reuse.

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07 Apr 2026 06:24Current
6.7Medium risk
Vulners AI Score6.7
CVSS 3.13.7
CVSS 24.3
EPSS0.00083
SSVC
file transferinvalid control bytetelnet IACpassword pathcwd commandconnection reusesecurity vulnerability
11