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CVE-2026-5773— wrong reuse of SMB connection

Quick assessment

Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.66% · P50

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 105

VendorProduct Version RangeStatus
curl curl 7.40.0< 8.14.2 affected
8.15.0< 8.16.1 affected
8.17.0< 8.20.0 affected
aec2e865f06669b9cb5d26cc1148d70bc418b163< 74a169575d6412dc0ff532acdf94de35a6c2a571 affected
8.19.0 affected
8.18.0 affected
8.17.0 affected
8.16.0 affected
… +97 more rows
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对错误会话暴露数据元素
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
curl curl 7.40.0 ~ 8.14.2 -
curl curl aec2e865f06669b9cb5d26cc1148d70bc418b163 ~ 74a169575d6412dc0ff532acdf94de35a6c2a571 -
curl curl 8.19.0 -

II. Public POCs for CVE-2026-5773

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III. Intelligence Information for CVE-2026-5773

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Vendor Advisories for CVE-2026-5773 (2)

News Coverage for CVE-2026-5773 (1)

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

Same product: curl
Same vendor: curl
Same weakness: CWE-488

V. Comments for CVE-2026-5773

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