CVE-2026-5773— wrong reuse of SMB connection
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-5773
Vulnerability Information
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Vulnerability Title
wrong reuse of SMB connection
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
libcurl 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libcurl是cURL开源的一个免费且易于使用的客户端 URL 传输库。 libcurl存在代码问题漏洞，该漏洞源于连接重用逻辑错误，可能导致SMB传输错误地重用使用不同共享的现有连接，从而导致下载或上传错误文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-5773
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Same Patch Batch · curl · 2026-05-13 · 8 CVEs total
| CVE-2026-7168 | cross-proxy Digest auth state leak | |
| CVE-2026-7009 | OCSP stapling bypass with Apple SecTrust | |
| CVE-2026-6253 | proxy credentials leak over redirect-to proxy | |
| CVE-2026-6429 | netrc credential leak with reused proxy connection | |
| CVE-2026-6276 | stale custom cookie host causes cookie leak | |
| CVE-2026-4873 | connection reuse ignores TLS requirement | |
| CVE-2026-5545 | wrong reuse of HTTP Negotiate connection |
IV. Related Vulnerabilities
V. Comments for CVE-2026-5773
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