CVE-2026-5773
HIGH EPSS 41.8%
Published May 13, 20261mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
Published May 13, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago
Description
libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None
Threat Intelligence
EPSS Exploit Probability
41.8% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available
Weaknesses 1
CWE-918 Server-Side Request Forgery (SSRF) Validation
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| haxx | curl | * | ≥7.40.0 – <8.20.0 |
References 4
- openwall.com http://www.openwall.com/lists/oss-security/2026/04/29/9
- curl.se https://curl.se/docs/CVE-2026-5773.html
- curl.se https://curl.se/docs/CVE-2026-5773.json
- hackerone.com https://hackerone.com/reports/3650689
Remediation
- openwall.com http://www.openwall.com/lists/oss-security/2026/04/29/9
- curl.se https://curl.se/docs/CVE-2026-5773.html