ESB-2026.5371

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.5371 Security update for curl 19 May 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: curl Publisher: SUSE Operating System: SUSE Resolution: Patch/Upgrade CVE Names: CVE-2026-1965 CVE-2026-6253 CVE-2026-6429 CVE-2026-6276 CVE-2026-5545 CVE-2026-4873 Original Bulletin: https://www.suse.com/support/update/announcement/2026/suse-su-20261940-1 Comment: CVSS (Max): 7.5 CVE-2026-1965 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N) CVSS Source: SUSE Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N EPSS (Max): 0.1% (21st) CVE-2026-1965 2026-05-18 - --------------------------BEGIN INCLUDED TEXT-------------------- Security update for curl Announcement ID: SUSE-SU-2026:1940-1 Release Date: 2026-05-18T07:44:21Z Rating: important o bsc#1259362 o bsc#1262631 o bsc#1262632 References: o bsc#1262635 o bsc#1262636 o bsc#1262638 o CVE-2026-1965 o CVE-2026-4873 o CVE-2026-5545 Cross-References: o CVE-2026-6253 o CVE-2026-6276 o CVE-2026-6429 o CVE-2026-1965 ( SUSE ): 6.9 CVSS:4.0/AV:L/AC:L/AT:P/PR:L/ UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N o CVE-2026-1965 ( SUSE ): 7.5 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/ S:C/C:H/I:H/A:N o CVE-2026-1965 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/ S:U/C:N/I:H/A:N o CVE-2026-4873 ( SUSE ): 6.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/ UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N o CVE-2026-4873 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/ S:U/C:L/I:N/A:N o CVE-2026-4873 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/ S:U/C:H/I:N/A:N o CVE-2026-5545 ( SUSE ): 8.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/ UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N o CVE-2026-5545 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/ S:U/C:L/I:H/A:N o CVE-2026-5545 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/ S:U/C:L/I:H/A:N o CVE-2026-5545 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/ S:U/C:L/I:H/A:N CVSS scores: o CVE-2026-6253 ( SUSE ): 8.2 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/ UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N o CVE-2026-6253 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/ S:U/C:H/I:N/A:N o CVE-2026-6253 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/ S:U/C:N/I:N/A:H o CVE-2026-6276 ( SUSE ): 6.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/ UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N o CVE-2026-6276 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/ S:U/C:L/I:N/A:N o CVE-2026-6276 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:N/I:N/A:H o CVE-2026-6276 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:N/I:N/A:H o CVE-2026-6429 ( SUSE ): 8.2 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/ UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N o CVE-2026-6429 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/ S:U/C:H/I:N/A:N o CVE-2026-6429 ( NVD ): 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/ S:U/C:H/I:N/A:N o openSUSE Leap 15.6 Affected o SUSE Linux Enterprise Server 15 SP6 Products: o SUSE Linux Enterprise Server 15 SP6 LTSS o SUSE Linux Enterprise Server for SAP Applications 15 SP6 An update that solves six vulnerabilities can now be installed. Description: This update for curl fixes the following issues: Security issues fixed: o CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631). o CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632). o CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635). o CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636). o CVE-2026-6429: netrc credential leak with reused proxy connection (bsc# 1262638). Other updates and bugfixes: o sws: prevent "connection monitor" to say disconnect twice (bsc#1259362). Patch Instructions: To install this SUSE update use the SUSE recommended installation methods like YaST online_update or "zypper patch". Alternatively you can run the command listed for your product: o openSUSE Leap 15.6 zypper in -t patch SUSE-2026-1940=1 o SUSE Linux Enterprise Server 15 SP6 LTSS zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-1940=1 o SUSE Linux Enterprise Server for SAP Applications 15 SP6 zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-1940=1 Package List: o openSUSE Leap 15.6 (aarch64 ppc64le s390x x86_64 i586) curl-mini-debugsource-8.14.1-150600.4.43.1 curl-8.14.1-150600.4.43.1 libcurl-mini4-debuginfo-8.14.1-150600.4.43.1 libcurl4-debuginfo-8.14.1-150600.4.43.1 curl-debuginfo-8.14.1-150600.4.43.1 libcurl-mini4-8.14.1-150600.4.43.1 libcurl-devel-8.14.1-150600.4.43.1 curl-debugsource-8.14.1-150600.4.43.1 libcurl4-8.14.1-150600.4.43.1 o openSUSE Leap 15.6 (noarch) curl-zsh-completion-8.14.1-150600.4.43.1 libcurl-devel-doc-8.14.1-150600.4.43.1 curl-fish-completion-8.14.1-150600.4.43.1 o openSUSE Leap 15.6 (x86_64) libcurl4-32bit-8.14.1-150600.4.43.1 libcurl-devel-32bit-8.14.1-150600.4.43.1 libcurl4-32bit-debuginfo-8.14.1-150600.4.43.1 o openSUSE Leap 15.6 (aarch64_ilp32) libcurl4-64bit-debuginfo-8.14.1-150600.4.43.1 libcurl-devel-64bit-8.14.1-150600.4.43.1 libcurl4-64bit-8.14.1-150600.4.43.1 o SUSE Linux Enterprise Server 15 SP6 LTSS (aarch64 ppc64le s390x x86_64) curl-8.14.1-150600.4.43.1 libcurl4-debuginfo-8.14.1-150600.4.43.1 curl-debuginfo-8.14.1-150600.4.43.1 libcurl-devel-8.14.1-150600.4.43.1 curl-debugsource-8.14.1-150600.4.43.1 libcurl4-8.14.1-150600.4.43.1 o SUSE Linux Enterprise Server 15 SP6 LTSS (x86_64) libcurl4-32bit-8.14.1-150600.4.43.1 libcurl4-32bit-debuginfo-8.14.1-150600.4.43.1 o SUSE Linux Enterprise Server for SAP Applications 15 SP6 (ppc64le x86_64) curl-8.14.1-150600.4.43.1 libcurl4-debuginfo-8.14.1-150600.4.43.1 curl-debuginfo-8.14.1-150600.4.43.1 libcurl-devel-8.14.1-150600.4.43.1 curl-debugsource-8.14.1-150600.4.43.1 libcurl4-8.14.1-150600.4.43.1 o SUSE Linux Enterprise Server for SAP Applications 15 SP6 (x86_64) libcurl4-32bit-8.14.1-150600.4.43.1 libcurl4-32bit-debuginfo-8.14.1-150600.4.43.1 References: o https://www.suse.com/security/cve/CVE-2026-1965.html o https://www.suse.com/security/cve/CVE-2026-4873.html o https://www.suse.com/security/cve/CVE-2026-5545.html o https://www.suse.com/security/cve/CVE-2026-6253.html o https://www.suse.com/security/cve/CVE-2026-6276.html o https://www.suse.com/security/cve/CVE-2026-6429.html o https://bugzilla.suse.com/show_bug.cgi?id=1259362 o https://bugzilla.suse.com/show_bug.cgi?id=1262631 o https://bugzilla.suse.com/show_bug.cgi?id=1262632 o https://bugzilla.suse.com/show_bug.cgi?id=1262635 o https://bugzilla.suse.com/show_bug.cgi?id=1262636 o https://bugzilla.suse.com/show_bug.cgi?id=1262638 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================