CVE-2026-56766 | BDVDB-2026-343377 Detail

Description#

Hydra through 9.7, fixed in commit 9cc84c2, contains a stack buffer overflow in NTLM authentication across SMTP, POP3, IMAP, NNTP, HTTP, HTTP-Proxy, and HTTP-Proxy-Urlenum modules when processing malicious NTLM Type-2 challenges. A malicious server can send a crafted NTLM Type-2 challenge with an excessively long domain string, causing base64-encoded response data to overflow a 500-byte stack buffer by 18 to 330 bytes, enabling remote code execution on systems without stack protection.

Impact#

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Exploit#

History#

1. Version 12026-06-25Record published in the CVE List.
2. Version 22026-07-14Most recent update recorded in the CVE List.