wrong reuse of SMB connection
CVE-2026-5773 is fixed in 7 products on 1 platform, first by curl 7.58.0-2ubuntu3.24+esm10, released April 29, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Debian 12.15 (bookworm) | 7.88.1-10+deb12u15 | DEBIAN-CVE-2026-5773 | May 15, 2026 |
| curl · Debian 13.5 (trixie) | 8.14.1-2+deb13u4 | DEBIAN-CVE-2026-5773 | May 15, 2026 |
| curl · Debian 14 | 8.20.0~rc2-1 | DEBIAN-CVE-2026-5773 | May 15, 2026 |
| curl · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm10 | curl 7.58.0-2ubuntu3.24+esm10 | Apr 29, 2026 |
| curl · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm5 | curl 7.68.0-1ubuntu2.25+esm5 | Apr 29, 2026 |
| curl · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | curl 7.81.0-1ubuntu1.24 | May 15, 2026 |
| curl · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.9 | curl 8.5.0-2ubuntu10.9 | May 15, 2026 |
| curl · Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.3 | curl 8.14.1-2ubuntu1.3 | May 15, 2026 |
| curl · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.1 | curl 8.18.0-1ubuntu2.1 | Apr 29, 2026 |
| curl · opensuse-leap 16.0 | 8.14.1-160000.9.1 | OPENSUSE-SU-2026:21774-1 | Sep 6, 2026 |
| curl · sles 15.6 | 8.14.1-150600.4.51.1 | SUSE-SU-2026:4047-1 | Sep 7, 2026 |
| curl · sles 15.7 | 8.14.1-150700.7.23.1 | SUSE-SU-2026:3798-1 | Aug 25, 2026 |
| curl · sles 16.0 | 8.14.1-160000.9.1 | SUSE-SU-2026:23638-1 | Sep 6, 2026 |
| curl-mini · sles 16.0 | 8.14.1-160000.9.1 | SUSE-SU-2026:23638-1 | Sep 6, 2026 |
| libcurl3-gnutls · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm10 | libcurl3-gnutls 7.58.0-2ubuntu3.24+esm10 | Apr 29, 2026 |
| libcurl3-gnutls · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm5 | libcurl3-gnutls 7.68.0-1ubuntu2.25+esm5 | Apr 29, 2026 |
| libcurl3-gnutls · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | libcurl3-gnutls 7.81.0-1ubuntu1.24 | May 15, 2026 |
| libcurl3-nss · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm10 | libcurl3-nss 7.58.0-2ubuntu3.24+esm10 | Apr 29, 2026 |
| libcurl3-nss · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm5 | libcurl3-nss 7.68.0-1ubuntu2.25+esm5 | Apr 29, 2026 |
| libcurl3-nss · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | libcurl3-nss 7.81.0-1ubuntu1.24 | May 15, 2026 |
| libcurl3t64-gnutls · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.9 | libcurl3t64-gnutls 8.5.0-2ubuntu10.9 | May 15, 2026 |
| libcurl3t64-gnutls · Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.3 | libcurl3t64-gnutls 8.14.1-2ubuntu1.3 | May 15, 2026 |
| libcurl3t64-gnutls · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.1 | libcurl3t64-gnutls 8.18.0-1ubuntu2.1 | Apr 29, 2026 |
| libcurl4 · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm10 | libcurl4 7.58.0-2ubuntu3.24+esm10 | Apr 29, 2026 |
| libcurl4 · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm5 | libcurl4 7.68.0-1ubuntu2.25+esm5 | Apr 29, 2026 |
| libcurl4 · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | libcurl4 7.81.0-1ubuntu1.24 | May 15, 2026 |
| libcurl4t64 · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.9 | libcurl4t64 8.5.0-2ubuntu10.9 | May 15, 2026 |
| libcurl4t64 · Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.3 | libcurl4t64 8.14.1-2ubuntu1.3 | May 15, 2026 |
| libcurl4t64 · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.1 | libcurl4t64 8.18.0-1ubuntu2.1 | Apr 29, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.