{"id":"UBUNTU-CVE-2026-87863","details":"An authenticated HTTPS origin can supply an HSTS `max-age` value that the parser accepts, but time serialization later fails to process. On 64-bit systems, extreme max-age values compute an absolute expiry within standard time integer limits that exceeds calendar time structure bounds. During cache saves, the original HSTS file is truncated before writing a temporary replacement; when serialization fails, the temporary file is deleted, leaving an empty or partial cache. Because the save error is silently ignored during cleanup, curl exits successfully despite the data loss.","modified":"2026-10-17T13:01:14.862224529Z","published":"2026-10-14T06:00:00Z","related":["USN-8927-1"],"upstream":["CVE-2026-87863"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-87863"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-87863"},{"type":"REPORT","url":"https://curl.se/docs/CVE-2026-87863.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8927-1"}],"affected":[{"package":{"name":"curl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/curl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","8.5.0-2ubuntu10.11","8.5.0-2ubuntu10.12","8.5.0-2ubuntu10.13","8.5.0-2ubuntu10.15","8.5.0-2ubuntu10.16"],"ecosystem_specific":{"priority_reason":"Upstream defined this as low severity","binaries":[{"binary_version":"8.5.0-2ubuntu10.16","binary_name":"curl"},{"binary_name":"libcurl3t64-gnutls","binary_version":"8.5.0-2ubuntu10.16"},{"binary_name":"libcurl4t64","binary_version":"8.5.0-2ubuntu10.16"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87863.json"}},{"package":{"name":"curl","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/curl?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.18.0-1ubuntu2","8.20.0-2ubuntu1","8.20.0-2ubuntu3","8.20.0-2ubuntu10","8.20.0-2ubuntu11"],"ecosystem_specific":{"binaries":[{"binary_name":"curl","binary_version":"8.20.0-2ubuntu11"},{"binary_name":"libcurl3t64-gnutls","binary_version":"8.20.0-2ubuntu11"},{"binary_name":"libcurl4t64","binary_version":"8.20.0-2ubuntu11"}],"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-2026-87863.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":"8.18.0-1ubuntu2.8"}]}],"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","8.18.0-1ubuntu2.7"],"ecosystem_specific":{"availability":"No subscription required","priority_reason":"Upstream defined this as low severity","binaries":[{"binary_version":"8.18.0-1ubuntu2.8","binary_name":"curl"},{"binary_name":"libcurl3t64-gnutls","binary_version":"8.18.0-1ubuntu2.8"},{"binary_name":"libcurl4t64","binary_version":"8.18.0-1ubuntu2.8"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87863.json"}}],"schema_version":"1.9.0","severity":[{"type":"Ubuntu","score":"low"}]}