CVE-2026-5773

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.

• curl 8.20.0~rc2-1 [trixie] - curl 8.14.1-2+deb13u4 [bookworm] - curl 7.88.1-10+deb12u15 [bullseye] - curl (Minor issue; can be fixed in next update) https://curl.se/docs/CVE-2026-5773.html Introduced by: https://github.com/curl/curl/commit/aec2e865f06669b9cb5d26cc1148d70bc418b163 (curl-7_40_0) Fixed by: https://github.com/curl/curl/commit/74a169575d6412dc0ff532acdf94de35a6c2a571 (rc-8_20_0-2)