{"id":"PSF-2026-14","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":["CVE-2026-4519"],"modified":"2026-04-21T18:41:14.315945742Z","published":"2026-03-20T15:08:32.576Z","database_specific":{"cwe_ids":[]},"references":[{"type":"WEB","url":"https://github.com/python/cpython/pull/143931"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/143930"},{"type":"ADVISORY","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/AY5NDSS433JK56Q7Q5IS7B37QFZVVOUS/"},{"type":"FIX","url":"https://github.com/python/cpython/commit/43fe06b96f6a6cf5cfd5bdab20b8649374956866"},{"type":"FIX","url":"https://github.com/python/cpython/commit/82a24a4442312bdcfc4c799885e8b3e00990f02b"},{"type":"FIX","url":"https://github.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d76"},{"type":"FIX","url":"https://github.com/python/cpython/commit/ad4d5ba32af4d80b0dfa2ba9d8203bfb219e60a5"},{"type":"FIX","url":"https://github.com/python/cpython/commit/ceac1efc66516ac387eef2c9a0ce671895b44f03"},{"type":"FIX","url":"https://github.com/python/cpython/commit/cbba6119391112aba9c5aebf7b94aea447922c48"},{"type":"FIX","url":"https://github.com/python/cpython/commit/3681d47a440865aead912a054d4599087b4270dd"},{"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/89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4"},{"type":"FIX","url":"https://github.com/python/cpython/commit/96fc5048605863c7b6fd6289643feb0e97edd96c"},{"type":"FIX","url":"https://github.com/python/cpython/commit/cc023511238ad93ecc8796157c6f9139a2bb2932"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"43fe06b96f6a6cf5cfd5bdab20b8649374956866"},{"fixed":"82a24a4442312bdcfc4c799885e8b3e00990f02b"},{"fixed":"9669a912a0e329c094e992204d6bdb8787024d76"},{"fixed":"ad4d5ba32af4d80b0dfa2ba9d8203bfb219e60a5"},{"fixed":"ceac1efc66516ac387eef2c9a0ce671895b44f03"},{"fixed":"cbba6119391112aba9c5aebf7b94aea447922c48"},{"fixed":"3681d47a440865aead912a054d4599087b4270dd"},{"fixed":"591ed890270c5697b013bf637029fb3e6cd2d73e"},{"fixed":"594b5a05dc9913880ac92eded440defbf32a28d1"},{"fixed":"89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4"},{"fixed":"96fc5048605863c7b6fd6289643feb0e97edd96c"},{"fixed":"cc023511238ad93ecc8796157c6f9139a2bb2932"}]}],"versions":["2.0","2.1","2.2","2.3","2.4","2.5","2.6","2.7","3.0","3.1","3.2","3.3","3.4","3.5","3.6","3.7","3.8","3.9","legacy-trunk","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","v2.0.1","v2.0.1c1","v2.0b1","v2.0b2","v2.0c1","v2.1","v2.1.1","v2.1.1c1","v2.1.2","v2.1.2c1","v2.1.3","v2.1a1","v2.1a2","v2.1b1","v2.1b2","v2.1c1","v2.1c2","v2.2","v2.2.1","v2.2.1c1","v2.2.1c2","v2.2.2","v2.2.2b1","v2.2.3","v2.2.3c1","v2.2a3","v2.3.1","v2.3.2","v2.3.2c1","v2.3.3","v2.3.3c1","v2.3.4","v2.3.4c1","v2.3.5","v2.3.5c1","v2.3.6","v2.3.6c1","v2.3.7","v2.3.7c1","v2.3c1","v2.3c2","v2.4","v2.4.1","v2.4.1c1","v2.4.1c2","v2.4.2","v2.4.2c1","v2.4.3","v2.4.3c1","v2.4.4","v2.4.4c1","v2.4.5","v2.4.5c1","v2.4.6","v2.4.6c1","v2.4a1","v2.4a2","v2.4a3","v2.4b1","v2.4b2","v2.4c1","v2.5","v2.5.1","v2.5.1c1","v2.5.2","v2.5.2c1","v2.5.3","v2.5.3c1","v2.5.4","v2.5.5","v2.5.5c1","v2.5.5c2","v2.5.6","v2.5.6c1","v2.5a0","v2.5a1","v2.5a2","v2.5b1","v2.5b2","v2.5b3","v2.5c1","v2.5c2","v2.6","v2.6.1","v2.6.2","v2.6.2c1","v2.6.3","v2.6.3rc1","v2.6.4","v2.6.4rc1","v2.6.4rc2","v2.6.5","v2.6.5rc1","v2.6.5rc2","v2.6.6","v2.6.6rc1","v2.6.6rc2","v2.6.7","v2.6.8","v2.6.8rc1","v2.6.8rc2","v2.6.9","v2.6.9rc1","v2.6a1","v2.6a2","v2.6a3","v2.6b1","v2.6b2","v2.6b3","v2.6rc1","v2.6rc2","v2.7","v2.7.1","v2.7.10","v2.7.10rc1","v2.7.11","v2.7.11rc1","v2.7.12","v2.7.12rc1","v2.7.13","v2.7.13rc1","v2.7.14","v2.7.14rc1","v2.7.15","v2.7.15rc1","v2.7.16","v2.7.16rc1","v2.7.17","v2.7.17rc1","v2.7.18","v2.7.18rc1","v2.7.1rc1","v2.7.2","v2.7.2rc1","v2.7.3","v2.7.3rc1","v2.7.3rc2","v2.7.4","v2.7.4rc1","v2.7.5","v2.7.6","v2.7.6rc1","v2.7.7","v2.7.7rc1","v2.7.8","v2.7.9","v2.7.9rc1","v2.7a1","v2.7a2","v2.7a3","v2.7a4","v2.7b1","v2.7b2","v2.7rc1","v2.7rc2","v3.0","v3.0.1","v3.0a1","v3.0a2","v3.0a3","v3.0a4","v3.0a5","v3.0b1","v3.0b2","v3.0b3","v3.0rc1","v3.0rc2","v3.0rc3","v3.1","v3.1.1","v3.1.1rc1","v3.1.2","v3.1.2rc1","v3.1.3","v3.1.3rc1","v3.1.4","v3.1.4rc1","v3.1.5","v3.1.5rc1","v3.1.5rc2","v3.10.0","v3.10.0a1","v3.10.0a2","v3.10.0a3","v3.10.0a4","v3.10.0a5","v3.10.0a6","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","v3.10.20","v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