When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into already freed memory.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://curl.se/docs/CVE-2026-3805.html
2499f714-1537-4658-8207-48ae4bb9eae9
https://curl.se/docs/CVE-2026-3805.json
2499f714-1537-4658-8207-48ae4bb9eae9
https://hackerone.com/reports/3591944
2499f714-1537-4658-8207-48ae4bb9eae9
http://www.openwall.com/lists/oss-security/2026/03/11/4
af854a3a-2127-422b-91ae-364da2661108