In curl before 7.86.0, the HSTS check could be bypassed to trick it into staying with HTTP. Using its HSTS support, curl can be instructed to use HTTPS directly (instead of using an insecure cleartext HTTP step) even when HTTP is provided in the URL. This mechanism could be bypassed if the host name in the given URL uses IDN characters that get replaced with ASCII counterparts as part of the IDN conversion, e.g., using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop of U+002E (.). The earliest affected version is 7.77.0 2021-05-26.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Mar 26, 2024 | Oct 29, 2022 |
| Amazon Linux Ami 2 | — | Upgrade curl-debuginfoUpgrade libcurlUpgrade curlUpgrade libcurl-devel | Dec 7, 2022 | Oct 29, 2022 |
| Amazon_linux_2023 | — | Upgrade libcurlUpgrade curl-minimal-debuginfoUpgrade curl-debuginfoUpgrade libcurl-debuginfoUpgrade curl-debugsourceUpgrade curlUpgrade libcurl-minimal-debuginfoUpgrade curl-minimalUpgrade libcurl-develUpgrade libcurl-minimal | Feb 17, 2025 | Oct 26, 2022 |
| Apple Osx Curl | — | Upgrade macOS to the latest version | Jan 24, 2023 | Jan 23, 2023 |
| Autodesk Autocad | — | Update Autodesk AutoCAD to the latest version for Windows and macOS. | May 29, 2026 | Jun 23, 2023 |
| Debian | — | Upgrade curl | Jul 30, 2024 | Oct 29, 2022 |
| Freebsd | — | Upgrade curl | Dec 14, 2022 | Dec 14, 2022 |
| Gentoo Linux | — | Upgrade net-misc/curl. | Dec 19, 2022 | Oct 29, 2022 |
| Huawei Euleros 2_0_sp11 | — | Upgrade curlUpgrade libcurl | Jan 6, 2023 | Oct 29, 2022 |
| Splunk | — | Upgrade Splunk Enterprise to version 9.0.5Upgrade Splunk Enterprise to version 9.0.6Upgrade Splunk Universal Forwarder to version 9.0.6Upgrade Splunk Universal Forwarder to version 9.0.5Upgrade Splunk Enterprise to version 9.1.1Upgrade Splunk Universal Forwarder to version 8.2.12Upgrade Splunk Enterprise to version 8.2.11Upgrade Splunk Universal Forwarder to version 9.1.1Upgrade Splunk Enterprise to version 8.1.14Upgrade Splunk Universal Forwarder to version 8.1.14Upgrade Splunk Universal Forwarder to version 8.2.11Upgrade Splunk Enterprise to version 8.2.12 | Sep 30, 2025 | Oct 29, 2022 |
| Suse | — | Upgrade libcurl4Upgrade curlUpgrade libcurl-devel-32bitUpgrade libcurl4-32bitUpgrade libcurl-devel | Oct 27, 2022 | Oct 27, 2022 |
| Ubuntu | — | Upgrade libcurl4Upgrade libcurl3-gnutlsUpgrade libcurl3-nssUpgrade curl | Oct 27, 2022 | Oct 26, 2022 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Oct 29, 2022 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub