VULNERABILITY INTELLIGENCE

CVE-2026-5773

CVSS score7.5 HIGH
EPSS probability0.62%
CISA KEVNot currently listed
Published2026-05-13
Last modified2026-09-15
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Weakness classification

  • CWE-488: Exposure of Data Element to Wrong Session
  • CWE-918: Server-Side Request Forgery (SSRF)

Primary references