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CVE PROGRAM SOURCE RECORD8.6 High

CVE-2026-56766

Hydra - Stack Buffer Overflow in NTLM Authentication Handler

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Status
Published
Published
Updated
Assigning organization
VulnCheck

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

vanhauser-thc thc-hydra

Default version status: unaffected

  • 0 to ≤ 9.7affected
  • 9cc84c20e75f5fef6bb1790bb9ada2afad2204e2unaffected
pkg:github/vanhauser-thc/thc-hydra

References