A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Mar 26, 2024 | Mar 30, 2023 |
| Amazon Linux Ami 2 | — | Upgrade libcurl-develUpgrade libcurlUpgrade curl-debuginfoUpgrade curl | Jun 8, 2023 | Mar 30, 2023 |
| Amazon_linux_2023 | — | Upgrade curl-debugsourceUpgrade libcurl-minimal-debuginfoUpgrade libcurlUpgrade curl-debuginfoUpgrade curl-minimal-debuginfoUpgrade libcurl-minimalUpgrade curl-minimalUpgrade curlUpgrade libcurl-develUpgrade libcurl-debuginfo | Feb 17, 2025 | Mar 20, 2023 |
| Debian | — | Upgrade curl | Jul 30, 2024 | Mar 30, 2023 |
| Freebsd | — | Upgrade curl | Mar 23, 2023 | Mar 20, 2023 |
| Gentoo Linux | — | Upgrade net-misc/curl. | Oct 12, 2023 | Mar 30, 2023 |
| Ibm Aix | — | Apply the fix or workaround for curl_advisory2 | Jul 27, 2023 | Mar 30, 2023 |
| Splunk | — | Upgrade Splunk Universal Forwarder to version 9.0.6Upgrade Splunk Enterprise to version 9.0.6Upgrade Splunk Enterprise to version 8.2.12Upgrade Splunk Enterprise to version 9.1.1Upgrade Splunk Universal Forwarder to version 9.1.1Upgrade Splunk Enterprise to version 8.1.14Upgrade Splunk Universal Forwarder to version 8.2.11Upgrade Splunk Universal Forwarder to version 8.1.14Upgrade Splunk Universal Forwarder to version 8.2.12Upgrade Splunk Universal Forwarder to version 9.0.5Upgrade Splunk Enterprise to version 8.2.11Upgrade Splunk Enterprise to version 9.0.5 | Sep 30, 2025 | Mar 30, 2023 |
| Suse | — | Upgrade libcurl4-32bitUpgrade curlUpgrade libcurl-develUpgrade libcurl4 | Jun 13, 2023 | Mar 30, 2023 |
| Ubuntu | — | Upgrade curl | Nov 19, 2024 | Mar 30, 2023 |
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