{"id":"CVE-2026-0865","details":"User-controlled header names and values containing newlines can allow injecting HTTP headers.","aliases":["BIT-libpython-2026-0865","BIT-python-2026-0865","BIT-python-min-2026-0865","PSF-2026-6"],"modified":"2026-04-16T08:44:19.088887256Z","published":"2026-01-20T22:15:52.800Z","related":["ALSA-2026:2128","ALSA-2026:4463","ALSA-2026:4473","ALSA-2026:4713","CGA-q8pr-wxrw-3vx3","SUSE-SU-2026:0590-1","SUSE-SU-2026:0612-1","SUSE-SU-2026:0613-1","SUSE-SU-2026:0642-1","SUSE-SU-2026:0643-1","SUSE-SU-2026:0644-1","SUSE-SU-2026:0645-1","SUSE-SU-2026:0663-1","SUSE-SU-2026:0664-1","SUSE-SU-2026:0693-1","SUSE-SU-2026:0767-1","SUSE-SU-2026:1349-1","SUSE-SU-2026:20543-1","SUSE-SU-2026:20581-1","SUSE-SU-2026:20665-1","SUSE-SU-2026:20710-1","SUSE-SU-2026:20768-1","SUSE-SU-2026:20796-1","openSUSE-SU-2026:10152-1","openSUSE-SU-2026:10200-1","openSUSE-SU-2026:10206-1","openSUSE-SU-2026:10221-1","openSUSE-SU-2026:10222-1","openSUSE-SU-2026:10223-1","openSUSE-SU-2026:20254-1"],"references":[{"type":"WEB","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/143916"},{"type":"FIX","url":"https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510"},{"type":"FIX","url":"https://github.com/python/cpython/commit/83ecd18779f286d872f68bfce175651e407d9fff"},{"type":"FIX","url":"https://github.com/python/cpython/commit/286e3ac39984fe85a17f4ab39c64d382137aae5f"},{"type":"FIX","url":"https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2"},{"type":"FIX","url":"https://github.com/python/cpython/commit/bfba660085767f8c2d582134e9d511a85eda04cf"},{"type":"FIX","url":"https://github.com/python/cpython/commit/c592227ffb48679af9845a45dbb0875d975bb219"},{"type":"FIX","url":"https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995"},{"type":"FIX","url":"https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211"},{"type":"FIX","url":"https://github.com/python/cpython/pull/143917"},{"type":"FIX","url":"https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58"},{"type":"FIX","url":"https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5"},{"type":"FIX","url":"https://github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6"},{"type":"FIX","url":"https://github.com/python/cpython/commit/8bb044d29310bb05d15086cdaa8bf64867d61a97"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"22e4d55285cee52bc4dbe061324e5f30bd4dee58"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"23e3c0ae867cca0130e441e776c9955b9027c510"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"286e3ac39984fe85a17f4ab39c64d382137aae5f"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"2f840249550e082dc351743f474ba56da10478d2"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"4802b96a2cde58570c24c13ef3289490980961c5"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"83ecd18779f286d872f68bfce175651e407d9fff"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"8bb044d29310bb05d15086cdaa8bf64867d61a97"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"bfba660085767f8c2d582134e9d511a85eda04cf"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"c592227ffb48679af9845a45dbb0875d975bb219"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"e4846a93ac07a8ae9aa18203af0dd13d6e7a6995"}]},{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"f7fceed79ca1bceae8dbe5ba5bc8928564da7211"}]}],"versions":["v0.9.8","v0.9.9","v1.0.1","v1.0.2","v1.1","v1.1.1","v1.2","v1.2b1","v1.2b2","v1.2b3","v1.2b4","v1.3","v1.3b1","v1.4","v1.4b1","v1.4b2","v1.4b3","v1.5","v1.5.1","v1.5.2","v1.5.2a1","v1.5.2a2","v1.5.2b1","v1.5.2b2","v1.5.2c1","v1.5a1","v1.5a2","v1.5a3","v1.5a4","v1.5b1","v1.5b2","v1.6a1","v1.6a2","v2.0","v2.0b1","v2.0b2","v2.0c1","v2.1","v2.1a1","v2.1a2","v2.1b1","v2.1b2","v2.1c1","v2.1c2","v2.2a3","v2.3c1","v2.3c2","v2.4","v2.4a1","v2.4a2","v2.4a3","v2.4b1","v2.4b2","v2.4c1","v3.0a1","v3.0a2","v3.0a3","v3.0a4","v3.0a5","v3.0b1","v3.0b2","v3.0b3","v3.0rc1","v3.0rc2","v3.0rc3","v3.1","v3.10.0a1","v3.10.0a7","v3.10.0b1","v3.10.0b2","v3.10.0b3","v3.10.0b4","v3.10.0rc1","v3.10.0rc2","v3.10.1","v3.10.10","v3.10.11","v3.10.12","v3.10.13","v3.10.14","v3.10.15","v3.10.16","v3.10.17","v3.10.18","v3.10.19","v3.10.2","v3.10.3","v3.10.4",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