{"cve":"CVE-2026-4519","nvd":{"published":"2026-03-20T15:16:24.057","modified":"2026-08-13T01:16:53.580","status":"Modified","description":"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().","cvss_v4":{"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":7.0},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","score":3.3},"cwes":["CWE-20","CWE-88"],"references":["https://github.com/python/cpython/commit/3681d47a440865aead912a054d4599087b4270dd","https://github.com/python/cpython/commit/43fe06b96f6a6cf5cfd5bdab20b8649374956866","https://github.com/python/cpython/commit/591ed890270c5697b013bf637029fb3e6cd2d73e","https://github.com/python/cpython/commit/594b5a05dc9913880ac92eded440defbf32a28d1","https://github.com/python/cpython/commit/82a24a4442312bdcfc4c799885e8b3e00990f02b"],"products":["python:python"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-4519","score":0.00314,"percentile":0.24299,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}