{"id":"UBUNTU-CVE-2026-10536","details":"A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl_easy_cleanup()`. During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation.","modified":"2026-07-11T00:15:08.772671820Z","published":"2026-06-24T14:00:00Z","related":["USN-8525-1"],"upstream":["CVE-2026-10536"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-10536"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-10536"},{"type":"REPORT","url":"https://curl.se/L7HzKXisfJ/CVE-2026-10536.md"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8525-1"}],"affected":[{"package":{"name":"curl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/curl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.0-2ubuntu10.11"}]}],"versions":["8.2.1-1ubuntu3","8.2.1-1ubuntu3.1","8.4.0-2ubuntu1","8.5.0-2ubuntu1","8.5.0-2ubuntu2","8.5.0-2ubuntu8","8.5.0-2ubuntu9","8.5.0-2ubuntu10","8.5.0-2ubuntu10.1","8.5.0-2ubuntu10.2","8.5.0-2ubuntu10.3","8.5.0-2ubuntu10.4","8.5.0-2ubuntu10.5","8.5.0-2ubuntu10.6","8.5.0-2ubuntu10.7","8.5.0-2ubuntu10.8","8.5.0-2ubuntu10.9","8.5.0-2ubuntu10.10"],"ecosystem_specific":{"binaries":[{"binary_version":"8.5.0-2ubuntu10.11","binary_name":"curl"},{"binary_name":"libcurl3t64-gnutls","binary_version":"8.5.0-2ubuntu10.11"},{"binary_name":"libcurl4t64","binary_version":"8.5.0-2ubuntu10.11"}],"availability":"No subscription required","priority_reason":"Upstream defined this as low severity"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-10536.json"}},{"package":{"name":"curl","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/curl?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.14.1-2ubuntu1.5"}]}],"versions":["8.12.1-3ubuntu1","8.13.0-5ubuntu1","8.14.1-1ubuntu2","8.14.1-1ubuntu3","8.14.1-2ubuntu1","8.14.1-2ubuntu1.1","8.14.1-2ubuntu1.2","8.14.1-2ubuntu1.3","8.14.1-2ubuntu1.4"],"ecosystem_specific":{"binaries":[{"binary_name":"curl","binary_version":"8.14.1-2ubuntu1.5"},{"binary_name":"libcurl3t64-gnutls","binary_version":"8.14.1-2ubuntu1.5"},{"binary_version":"8.14.1-2ubuntu1.5","binary_name":"libcurl4t64"}],"availability":"No subscription required","priority_reason":"Upstream defined this as low severity"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-10536.json"}},{"package":{"name":"curl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/curl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.18.0-1ubuntu2.3"}]}],"versions":["8.14.1-2ubuntu1","8.17.0-1ubuntu1","8.18.0-1ubuntu1","8.18.0-1ubuntu2","8.18.0-1ubuntu2.1","8.18.0-1ubuntu2.2"],"ecosystem_specific":{"binaries":[{"binary_version":"8.18.0-1ubuntu2.3","binary_name":"curl"},{"binary_name":"libcurl3t64-gnutls","binary_version":"8.18.0-1ubuntu2.3"},{"binary_name":"libcurl4t64","binary_version":"8.18.0-1ubuntu2.3"}],"availability":"No subscription required","priority_reason":"Upstream defined this as low severity"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-10536.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"low"}]}