{"id":"CVE-2026-4519","title":"The webbrowser.open() API would accept leading dashes in the URL which \ncould be handled as command line options for certain web browsers","summary":"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 …","severity":"low","cvss":3.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","cwe":["CWE-20","CWE-88"],"vendor":"python","product":"python","affected":["python < 3.13.13","python >= 3.14.0, < 3.14.4","python = 3.15.0"],"patched":["python 3.14.4"],"published":"2026-03-20","updated":"2026-08-13","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-4519","references":[{"url":"https://github.com/python/cpython/commit/3681d47a440865aead912a054d4599087b4270dd","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/43fe06b96f6a6cf5cfd5bdab20b8649374956866","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/591ed890270c5697b013bf637029fb3e6cd2d73e","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/594b5a05dc9913880ac92eded440defbf32a28d1","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/82a24a4442312bdcfc4c799885e8b3e00990f02b","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d76","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/96fc5048605863c7b6fd6289643feb0e97edd96c","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/ad4d5ba32af4d80b0dfa2ba9d8203bfb219e60a5","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/cbba6119391112aba9c5aebf7b94aea447922c48","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/cc023511238ad93ecc8796157c6f9139a2bb2932","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/ceac1efc66516ac387eef2c9a0ce671895b44f03","label":"cna@python.org"},{"url":"https://github.com/python/cpython/issues/143930","label":"cna@python.org"},{"url":"https://github.com/python/cpython/pull/143931","label":"cna@python.org"},{"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/AY5NDSS433JK56Q7Q5IS7B37QFZVVOUS/","label":"cna@python.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/03/20/1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2026:10065","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:10101","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:10102","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:10111","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:10140","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:10141","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:13812","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:16008","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:16009","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:16030","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:16174","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19019","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19064","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19175","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19176","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19177","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19216","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19724","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19725","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:21275","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25096","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6016","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6035","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6256","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6281","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6283","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6285","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6286","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6473","label":"0b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Overview\n\nThe 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().\n\n## Affected\n\n- `python < 3.13.13`\n- `python >= 3.14.0, < 3.14.4`\n- `python = 3.15.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `python 3.14.4`","depth":"sunlit","depthScore":18,"depthScoreParts":{"impact":18.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}