# CVE-2026-5773: 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. - Web page: https://patchblox.com/security/cve/CVE-2026-5773 - Priority: High - CVSS: 7.5 (Moderate) - EPSS: 0.0062 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 29, 2026 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-5773 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | curl Debian 12.15 (bookworm) | 7.88.1-10+deb12u15 | [DEBIAN-CVE-2026-5773](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5773.md) | May 15, 2026 | | Linux | curl Debian 13.5 (trixie) | 8.14.1-2+deb13u4 | [DEBIAN-CVE-2026-5773](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5773.md) | May 15, 2026 | | Linux | curl Debian 14 | 8.20.0~rc2-1 | [DEBIAN-CVE-2026-5773](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5773.md) | May 15, 2026 | | Linux | curl Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm10 | [curl 7.58.0-2ubuntu3.24+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-curl-7.58.0-2ubuntu3.24-esm10.md) | Apr 29, 2026 | | Linux | curl Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm5 | [curl 7.68.0-1ubuntu2.25+esm5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-curl-7.68.0-1ubuntu2.25-esm5.md) | Apr 29, 2026 | | Linux | curl Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | [curl 7.81.0-1ubuntu1.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-curl-7.81.0-1ubuntu1.24.md) | May 15, 2026 | | Linux | curl Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.9 | [curl 8.5.0-2ubuntu10.9](https://patchblox.com/security/data/fix/linux/ubuntu-noble-curl-8.5.0-2ubuntu10.9.md) | May 15, 2026 | | Linux | curl Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.3 | [curl 8.14.1-2ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-curl-8.14.1-2ubuntu1.3.md) | May 15, 2026 | | Linux | curl Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.1 | [curl 8.18.0-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-curl-8.18.0-1ubuntu2.1.md) | Apr 29, 2026 | | Linux | curl opensuse-leap 16.0 | 8.14.1-160000.9.1 | [OPENSUSE-SU-2026:21774-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21774-1.md) | Sep 6, 2026 | | Linux | curl sles 15.6 | 8.14.1-150600.4.51.1 | [SUSE-SU-2026:4047-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4047-1.md) | Sep 7, 2026 | | Linux | curl sles 15.7 | 8.14.1-150700.7.23.1 | [SUSE-SU-2026:3798-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3798-1.md) | Aug 25, 2026 | | Linux | curl sles 16.0 | 8.14.1-160000.9.1 | [SUSE-SU-2026:23638-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23638-1.md) | Sep 6, 2026 | | Linux | curl-mini sles 16.0 | 8.14.1-160000.9.1 | [SUSE-SU-2026:23638-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23638-1.md) | Sep 6, 2026 | | Linux | libcurl3-gnutls Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm10 | [libcurl3-gnutls 7.58.0-2ubuntu3.24+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-gnutls-7.58.0-2ubuntu3.24-esm10.md) | Apr 29, 2026 | | Linux | libcurl3-gnutls Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm5 | [libcurl3-gnutls 7.68.0-1ubuntu2.25+esm5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-gnutls-7.68.0-1ubuntu2.25-esm5.md) | Apr 29, 2026 | | Linux | libcurl3-gnutls Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | [libcurl3-gnutls 7.81.0-1ubuntu1.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.81.0-1ubuntu1.24.md) | May 15, 2026 | | Linux | libcurl3-nss Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm10 | [libcurl3-nss 7.58.0-2ubuntu3.24+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-nss-7.58.0-2ubuntu3.24-esm10.md) | Apr 29, 2026 | | Linux | libcurl3-nss Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm5 | [libcurl3-nss 7.68.0-1ubuntu2.25+esm5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-nss-7.68.0-1ubuntu2.25-esm5.md) | Apr 29, 2026 | | Linux | libcurl3-nss Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | [libcurl3-nss 7.81.0-1ubuntu1.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-nss-7.81.0-1ubuntu1.24.md) | May 15, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.9 | [libcurl3t64-gnutls 8.5.0-2ubuntu10.9](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl3t64-gnutls-8.5.0-2ubuntu10.9.md) | May 15, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.3 | [libcurl3t64-gnutls 8.14.1-2ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcurl3t64-gnutls-8.14.1-2ubuntu1.3.md) | May 15, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.1 | [libcurl3t64-gnutls 8.18.0-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl3t64-gnutls-8.18.0-1ubuntu2.1.md) | Apr 29, 2026 | | Linux | libcurl4 Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm10 | [libcurl4 7.58.0-2ubuntu3.24+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl4-7.58.0-2ubuntu3.24-esm10.md) | Apr 29, 2026 | | Linux | libcurl4 Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm5 | [libcurl4 7.68.0-1ubuntu2.25+esm5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl4-7.68.0-1ubuntu2.25-esm5.md) | Apr 29, 2026 | | Linux | libcurl4 Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | [libcurl4 7.81.0-1ubuntu1.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl4-7.81.0-1ubuntu1.24.md) | May 15, 2026 | | Linux | libcurl4t64 Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.9 | [libcurl4t64 8.5.0-2ubuntu10.9](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl4t64-8.5.0-2ubuntu10.9.md) | May 15, 2026 | | Linux | libcurl4t64 Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.3 | [libcurl4t64 8.14.1-2ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcurl4t64-8.14.1-2ubuntu1.3.md) | May 15, 2026 | | Linux | libcurl4t64 Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.1 | [libcurl4t64 8.18.0-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl4t64-8.18.0-1ubuntu2.1.md) | Apr 29, 2026 | --- Data as of 2026-11-08T06:59:42Z UTC. 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