{"id":"CVE-2026-4519","summary":"webbrowser.open() allows leading dashes in URLs","details":"The webbrowser.open() API would accept leading dashes in the URL which \ncould be handled as command line options for certain web browsers. New \nbehavior rejects leading dashes. Users are recommended to sanitize URLs \nprior to passing to webbrowser.open().","aliases":["PSF-2026-14"],"modified":"2026-05-01T04:32:53.250954Z","published":"2026-03-20T15:08:32.576Z","related":["ALSA-2026:6256","ALSA-2026:6281","ALSA-2026:6283","ALSA-2026:6285","ALSA-2026:6286","ALSA-2026:6473","ALSA-2026:6766","CGA-mwjj-543v-2qxw","SUSE-SU-2026:1206-1","SUSE-SU-2026:1292-1","SUSE-SU-2026:1296-1","SUSE-SU-2026:1345-1","SUSE-SU-2026:1349-1","SUSE-SU-2026:1354-1","SUSE-SU-2026:1376-1","SUSE-SU-2026:1385-1","SUSE-SU-2026:1417-1","SUSE-SU-2026:1530-1","SUSE-SU-2026:21104-1","SUSE-SU-2026:21178-1","SUSE-SU-2026:21254-1","openSUSE-SU-2026:10469-1","openSUSE-SU-2026:10477-1","openSUSE-SU-2026:10478-1","openSUSE-SU-2026:10479-1","openSUSE-SU-2026:10480-1","openSUSE-SU-2026:10481-1","openSUSE-SU-2026:20517-1"],"database_specific":{"cna_assigner":"PSF","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4519.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/03/20/1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4519.json"},{"type":"PACKAGE","url":"https://github.com/python/cpython"},{"type":"FIX","url":"https://github.com/python/cpython/commit/3681d47a440865aead912a054d4599087b4270dd"},{"type":"FIX","url":"https://github.com/python/cpython/commit/43fe06b96f6a6cf5cfd5bdab20b8649374956866"},{"type":"FIX","url":"https://github.com/python/cpython/commit/591ed890270c5697b013bf637029fb3e6cd2d73e"},{"type":"FIX","url":"https://github.com/python/cpython/commit/594b5a05dc9913880ac92eded440defbf32a28d1"},{"type":"FIX","url":"https://github.com/python/cpython/commit/82a24a4442312bdcfc4c799885e8b3e00990f02b"},{"type":"FIX","url":"https://github.com/python/cpython/commit/89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4"},{"type":"FIX","url":"https://github.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d76"},{"type":"FIX","url":"https://github.com/python/cpython/commit/96fc5048605863c7b6fd6289643feb0e97edd96c"},{"type":"FIX","url":"https://github.com/python/cpython/commit/ad4d5ba32af4d80b0dfa2ba9d8203bfb219e60a5"},{"type":"FIX","url":"https://github.com/python/cpython/commit/cbba6119391112aba9c5aebf7b94aea447922c48"},{"type":"FIX","url":"https://github.com/python/cpython/commit/cc023511238ad93ecc8796157c6f9139a2bb2932"},{"type":"FIX","url":"https://github.com/python/cpython/commit/ceac1efc66516ac387eef2c9a0ce671895b44f03"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/143930"},{"type":"FIX","url":"https://github.com/python/cpython/pull/143931"},{"type":"ADVISORY","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/AY5NDSS433JK56Q7Q5IS7B37QFZVVOUS/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4519"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"01104ce1beb3135c2e0c01ec835b994c1f55a1c0"},{"introduced":"ebf955df7a89ed0c7968f79faec1de49f61ed7cb"},{"fixed":"23116f998f6789d8c2fbe5ed5b8146854c8c2a4f"},{"introduced":"aeff92d86a3f3bd2d3a32b36ba75f84ff2c279d8"},{"fixed":"55ea59e7dc35e1363b203ae4dd9cfc3a0ac0a844"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"3.13.13"},{"introduced":"3.14.0"},{"fixed":"3.14.4"},{"introduced":"3.15.0a1"},{"fixed":"3.15.0a8"}]}}],"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","v3.11.0a3","v3.11.0a4","v3.11.0a5","v3.11.0a6","v3.11.0a7","v3.11.0b1","v3.12.0a1","v3.12.0a2","v3.12.0a3","v3.12.0a4","v3.12.0a5","v3.12.0a6","v3.12.0a7","v3.12.0b1","v3.13.0","v3.13.0a1","v3.13.0a2","v3.13.0a3","v3.13.0a4","v3.13.0a5","v3.13.0a6","v3.13.0b1","v3.13.0b2","v3.13.0b3","v3.13.0b4","v3.13.0rc1","v3.13.0rc2","v3.13.0rc3","v3.13.1","v3.13.10","v3.13.11","v3.13.12","v3.13.2","v3.13.3","v3.13.4","v3.13.5","v3.13.6","v3.13.7","v3.13.8","v3.14.0","v3.14.1","v3.14.2","v3.14.3","v3.15.0a1","v3.15.0a2","v3.15.0a3","v3.15.0a4","v3.15.0a5","v3.15.0a6","v3.15.0a7","v3.1a1","v3.1a2","v3.1b1","v3.1rc1","v3.1rc2","v3.2a1","v3.2a2","v3.2a3","v3.2a4","v3.2b1","v3.2b2","v3.2rc1","v3.2rc2","v3.2rc3","v3.3.0a2","v3.3.0a3","v3.3.0a4","v3.3.0b1","v3.3.0b2","v3.3.0rc1","v3.3.0rc2","v3.3.0rc3","v3.4.0a1","v3.4.0a2","v3.4.0a3","v3.4.0a4","v3.4.0b1","v3.4.0b2","v3.4.0b3","v3.5.0a1","v3.5.0a2","v3.5.0a3","v3.5.0a4","v3.5.0b1","v3.6.0a3","v3.6.0b1","v3.7.0a2","v3.9.0a2"],"database_specific":{"source":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