CVE-2026-5773
Fixed in a distro release EPSS <1%CVSS 7.5
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.
Products: curl
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.21 | curl | 8.14.1-r3 |
| Alpine 3.22 | curl | 8.14.1-r4 |
| Alpine 3.23 | curl | 8.20.0-r0 |
| Alpine 3.24 | curl | 8.20.0-r0 |
| Chainguard | libcurl4 | no fix |
| Debian 12 | curl | 7.88.1-10+deb12u15 |
| Debian 13 | curl | 8.14.1-2+deb13u4 |
| Debian 14 | curl | 8.20.0~rc2-1 |
| Red Hat hummingbird 1 | curl | 0:8.20.0-0.1.hum1 |
| Red Hat hummingbird 1 | libcurl | 0:8.20.0-0.1.hum1 |
| Red Hat hummingbird 1 | libcurl-devel | 0:8.20.0-0.1.hum1 |
| Red Hat hummingbird 1 | libcurl-minimal | 0:8.20.0-0.1.hum1 |
| SUSE Linux Enterprise Micro 5.3 | curl | 8.14.1-150400.5.91.1 |
| SUSE Linux Enterprise Micro 5.4 | curl | 8.14.1-150400.5.91.1 |
| SUSE Linux Enterprise Micro 5.5 | curl | 8.14.1-150400.5.91.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | curl | 8.14.1-150700.7.23.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | curl | 8.14.1-150600.4.51.1 |
| SUSE Linux Enterprise Server 16.0 | curl | 8.14.1-160000.9.1 |
| SUSE Linux Enterprise Server 16.0 | curl-mini | 8.14.1-160000.9.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | curl | 8.0.1-11.123.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | curl | 8.14.1-150600.4.51.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | curl | 8.14.1-160000.9.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | curl-mini | 8.14.1-160000.9.1 |
| SUSE Linux Micro 6.0 | curl | 8.14.1-8.1 |
| SUSE Linux Micro 6.1 | curl | 8.14.1-slfo.1.1_9.1 |
| SUSE Linux Micro 6.2 | curl | 8.14.1-160000.9.1 |
| Ubuntu 22.04 LTS | curl | 7.81.0-1ubuntu1.24 |
| Ubuntu 24.04 LTS | curl | 8.5.0-2ubuntu10.11 |
| Ubuntu 24.04 LTS | curl | 8.5.0-2ubuntu10.9 |
| Ubuntu 25.10 | curl | 8.14.1-2ubuntu1.5 |
| Ubuntu 25.10 | curl | 8.14.1-2ubuntu1.3 |
| Ubuntu 26.04 LTS | curl | 8.18.0-1ubuntu2.1 |
| Ubuntu 26.04 LTS | curl | 8.18.0-1ubuntu2.3 |
| Ubuntu Pro 14.04 LTS | curl | 7.35.0-1ubuntu2.20+esm21 |
| Ubuntu Pro 16.04 LTS | curl | 7.47.0-1ubuntu2.19+esm17 |
| Ubuntu Pro 18.04 LTS | curl | 7.58.0-2ubuntu3.24+esm10 |
| Ubuntu Pro 20.04 LTS | curl | 7.68.0-1ubuntu2.25+esm5 |
| Wolfi | libcurl4 | no fix |
| openSUSE Leap 16.0 | curl | 8.14.1-160000.9.1 |
| openSUSE Tumbleweed | curl | 8.20.0-1.1 |