{"id":"USN-8099-1","summary":"curl vulnerabilities","details":"Zhicheng Chen discovered that curl could incorrectly reuse the wrong\nconnection for Negotiate-authenticated HTTP or HTTPS requests. This could\nresult in the use of credentials from a different connection, contrary to\nexpectations. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-1965)\n\nIt was discovered that curl incorrectly leaked OAuth2 bearer tokens when\nfollowing a redirect. This could result in tokens being sent to the wrong\nhost, contrary to expectations. This issue only affected Ubuntu 20.04 LTS.\n(CVE-2026-3783)\n\nMuhamad Arga Reksapati discovered that curl incorrectly reused existing\nHTTP proxy connections even if the request used different credentials. This\ncould result in the use of incorrect credentials, contrary to expectations.\n(CVE-2026-3784)","modified":"2026-04-27T18:07:20.264220Z","published":"2026-03-16T17:35:41Z","related":["UBUNTU-CVE-2026-1965","UBUNTU-CVE-2026-3783","UBUNTU-CVE-2026-3784"],"upstream":["CVE-2026-1965","CVE-2026-3783","CVE-2026-3784","UBUNTU-CVE-2026-1965","UBUNTU-CVE-2026-3783","UBUNTU-CVE-2026-3784"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8099-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-1965"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-3783"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-3784"}],"affected":[{"package":{"name":"curl","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/curl@7.58.0-2ubuntu3.24+esm8?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.58.0-2ubuntu3.24+esm8"}]}],"versions":["7.55.1-1ubuntu2","7.55.1-1ubuntu2.1","7.57.0-1ubuntu1","7.58.0-2ubuntu1","7.58.0-2ubuntu2","7.58.0-2ubuntu3","7.58.0-2ubuntu3.1","7.58.0-2ubuntu3.2","7.58.0-2ubuntu3.3","7.58.0-2ubuntu3.5","7.58.0-2ubuntu3.6","7.58.0-2ubuntu3.7","7.58.0-2ubuntu3.8","7.58.0-2ubuntu3.9","7.58.0-2ubuntu3.10","7.58.0-2ubuntu3.12","7.58.0-2ubuntu3.13","7.58.0-2ubuntu3.14","7.58.0-2ubuntu3.15","7.58.0-2ubuntu3.16","7.58.0-2ubuntu3.17","7.58.0-2ubuntu3.18","7.58.0-2ubuntu3.19","7.58.0-2ubuntu3.20","7.58.0-2ubuntu3.21","7.58.0-2ubuntu3.22","7.58.0-2ubuntu3.23","7.58.0-2ubuntu3.24","7.58.0-2ubuntu3.24+esm1","7.58.0-2ubuntu3.24+esm2","7.58.0-2ubuntu3.24+esm3","7.58.0-2ubuntu3.24+esm4","7.58.0-2ubuntu3.24+esm5","7.58.0-2ubuntu3.24+esm7"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"7.58.0-2ubuntu3.24+esm8","binary_name":"curl"},{"binary_version":"7.58.0-2ubuntu3.24+esm8","binary_name":"libcurl3-gnutls"},{"binary_version":"7.58.0-2ubuntu3.24+esm8","binary_name":"libcurl3-nss"},{"binary_version":"7.58.0-2ubuntu3.24+esm8","binary_name":"libcurl4"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2026-3784"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8099-1.json"}},{"package":{"name":"curl","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/curl@7.68.0-1ubuntu2.25+esm3?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.68.0-1ubuntu2.25+esm3"}]}],"versions":["7.65.3-1ubuntu3","7.65.3-1ubuntu4","7.66.0-1ubuntu1","7.67.0-2ubuntu1","7.68.0-1ubuntu1","7.68.0-1ubuntu2","7.68.0-1ubuntu2.1","7.68.0-1ubuntu2.2","7.68.0-1ubuntu2.4","7.68.0-1ubuntu2.5","7.68.0-1ubuntu2.6","7.68.0-1ubuntu2.7","7.68.0-1ubuntu2.10","7.68.0-1ubuntu2.11","7.68.0-1ubuntu2.12","7.68.0-1ubuntu2.13","7.68.0-1ubuntu2.14","7.68.0-1ubuntu2.15","7.68.0-1ubuntu2.16","7.68.0-1ubuntu2.18","7.68.0-1ubuntu2.19","7.68.0-1ubuntu2.20","7.68.0-1ubuntu2.21","7.68.0-1ubuntu2.22","7.68.0-1ubuntu2.23","7.68.0-1ubuntu2.24","7.68.0-1ubuntu2.25","7.68.0-1ubuntu2.25+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"7.68.0-1ubuntu2.25+esm3","binary_name":"curl"},{"binary_version":"7.68.0-1ubuntu2.25+esm3","binary_name":"libcurl3-gnutls"},{"binary_version":"7.68.0-1ubuntu2.25+esm3","binary_name":"libcurl3-nss"},{"binary_version":"7.68.0-1ubuntu2.25+esm3","binary_name":"libcurl4"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-1965"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-3783"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2026-3784"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8099-1.json"}}],"schema_version":"1.7.5"}