CVE-2018-1000007: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 6.6% chance of exploitation in the next 30 days.

libcurl 7.1 through 7.57.0 might accidentally leak authentication data to third parties. When asked to send custom headers in its HTTP requests, libcurl will send that set of headers first to the host in the initial URL but also, if asked to follow redirects and a 30X HTTP response code is returned, to the host mentioned in URL in the `Location:` response header value. Sending the same set of headers to subsequent hosts is in particular a problem for applications that pass on custom `Authorization:` headers, as this header often contains privacy sensitive information or data that could allow others to impersonate the libcurl-using client's request.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only; version 17.10 only
• Debian Debian Linux: version 7.0 only; version 8.0 only; version 9.0 only
• Fujitsu m10-1 Firmware: before xcp2361 (fixed in xcp2361); before xcp3070 (fixed in xcp3070)
• Fujitsu m10-4 Firmware: before xcp2361 (fixed in xcp2361); before xcp3070 (fixed in xcp3070)
• Fujitsu m10-4s Firmware: before xcp2361 (fixed in xcp2361); before xcp3070 (fixed in xcp3070)
• Fujitsu m12-1 Firmware: before xcp2361 (fixed in xcp2361); before xcp3070 (fixed in xcp3070)
• Fujitsu m12-2 Firmware: before xcp2361 (fixed in xcp2361); before xcp3070 (fixed in xcp3070)
• Fujitsu m12-2s Firmware: before xcp2361 (fixed in xcp2361); before xcp3070 (fixed in xcp3070)
• Haxx Curl: from 7.1, up to and including 7.57.0
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.4 only
• Red Hat Enterprise Linux Server Eus: version 7.4 only; version 7.5 only
• Red Hat Enterprise Linux Workstation: version 7.0 only

Published 2018-01-24. Last modified 2026-06-17.