{"id":"UBUNTU-CVE-2026-80255","details":"A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of space (ascii code 32) immediately before the `Secure` attribute causes curl to store the cookie without its Secure flag. The cookie might then wrongfully be sent over plaintext HTTP on subsequent requests to the same host.","modified":"2026-09-16T11:41:47Z","published":"2026-09-06T18:17:00Z","upstream":["CVE-2026-80255"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-80255"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-80255"},{"type":"REPORT","url":"https://curl.se/docs/CVE-2026-80255.html"},{"type":"REPORT","url":"https://github.com/curl/curl/commit/4f6aa41a0145e930e76677"}],"affected":[{"package":{"name":"curl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/curl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","8.18.0-1ubuntu2.3","8.18.0-1ubuntu2.4","8.18.0-1ubuntu2.5"],"ecosystem_specific":{"binaries":[{"binary_name":"curl","binary_version":"8.18.0-1ubuntu2.5"},{"binary_name":"libcurl3t64-gnutls","binary_version":"8.18.0-1ubuntu2.5"},{"binary_name":"libcurl4t64","binary_version":"8.18.0-1ubuntu2.5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-80255.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}