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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Jun 18, 2026 | May 13, 2026 |
| Debian | — | Upgrade curl | Jul 12, 2026 | Jul 12, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Apr 29, 2026 |
| Ubuntu | — | Upgrade libcurl4-nss-dev (Ubuntu Pro)Upgrade libcurl4-openssl-dev (Ubuntu Pro)Upgrade libcurl4-gnutls-dev (Ubuntu Pro)Upgrade libcurl4Upgrade libcurl4-openssl-devUpgrade libcurl3-gnutlsUpgrade libcurl3-nssUpgrade libcurl4 (Ubuntu Pro)Upgrade libcurl4-gnutls-devUpgrade libcurl4t64Upgrade curlUpgrade libcurl3-nss (Ubuntu Pro)Upgrade curl (Ubuntu Pro)Upgrade libcurl3t64-gnutlsUpgrade libcurl3-gnutls (Ubuntu Pro)Upgrade libcurl3 (Ubuntu Pro) | May 4, 2026 | Apr 29, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 13, 2026 |
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