{"id":"UBUNTU-CVE-2026-0865","details":"User-controlled header names and values containing newlines can allow injecting HTTP headers.","modified":"2026-03-24T12:14:29.155755Z","published":"2026-01-20T22:15:00Z","related":["USN-8018-1","USN-8018-3"],"upstream":["CVE-2026-0865"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-0865"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-0865"},{"type":"REPORT","url":"https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58"},{"type":"REPORT","url":"https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510"},{"type":"REPORT","url":"https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2"},{"type":"REPORT","url":"https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5"},{"type":"REPORT","url":"https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995"},{"type":"REPORT","url":"https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/143916"},{"type":"REPORT","url":"https://github.com/python/cpython/pull/143917"},{"type":"REPORT","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8018-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8018-3"}],"affected":[{"package":{"name":"python2.7","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/python2.7@2.7.6-8ubuntu0.6+esm29?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.6-8ubuntu0.6+esm29"}]}],"versions":["2.7.5-8ubuntu3","2.7.5-8ubuntu4","2.7.6-2","2.7.6-2ubuntu1","2.7.6-3","2.7.6-3ubuntu1","2.7.6-4","2.7.6-4ubuntu1","2.7.6-5","2.7.6-7","2.7.6-8","2.7.6-8ubuntu0.2","2.7.6-8ubuntu0.3","2.7.6-8ubuntu0.4","2.7.6-8ubuntu0.5","2.7.6-8ubuntu0.6+esm2","2.7.6-8ubuntu0.6+esm3","2.7.6-8ubuntu0.6+esm5","2.7.6-8ubuntu0.6+esm6","2.7.6-8ubuntu0.6+esm7","2.7.6-8ubuntu0.6+esm8","2.7.6-8ubuntu0.6+esm9","2.7.6-8ubuntu0.6+esm10","2.7.6-8ubuntu0.6+esm11","2.7.6-8ubuntu0.6+esm12","2.7.6-8ubuntu0.6+esm13","2.7.6-8ubuntu0.6+esm14","2.7.6-8ubuntu0.6+esm15","2.7.6-8ubuntu0.6+esm16","2.7.6-8ubuntu0.6+esm17","2.7.6-8ubuntu0.6+esm18","2.7.6-8ubuntu0.6+esm20","2.7.6-8ubuntu0.6+esm21","2.7.6-8ubuntu0.6+esm22","2.7.6-8ubuntu0.6+esm24","2.7.6-8ubuntu0.6+esm25","2.7.6-8ubuntu0.6+esm26","2.7.6-8ubuntu0.6+esm28"],"ecosystem_specific":{"binaries":[{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"idle-python2.7"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"libpython2.7"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"libpython2.7-dev"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"libpython2.7-minimal"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"libpython2.7-stdlib"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"libpython2.7-testsuite"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"python2.7"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"python2.7-dev"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"python2.7-examples"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"python2.7-minimal"}],"availability":"Available 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