CVE-2026-4519

webbrowser.open() allows leading dashes in URLs

CVSS 7 HIGHEPSS 0.2%CWE-20

The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers. New behavior rejects leading dashes. Users are recommended to sanitize URLs prior to passing to webbrowser.open().

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

Affected products

Python Software Foundation · CPython

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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 https://github.com/python/cpython/commit/89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4 https://github.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d76 https://github.com/python/cpython/commit/96fc5048605863c7b6fd6289643feb0e97edd96c https://github.com/python/cpython/commit/ad4d5ba32af4d80b0dfa2ba9d8203bfb219e60a5 https://github.com/python/cpython/commit/cbba6119391112aba9c5aebf7b94aea447922c48 https://github.com/python/cpython/commit/cc023511238ad93ecc8796157c6f9139a2bb2932 https://github.com/python/cpython/commit/ceac1efc66516ac387eef2c9a0ce671895b44f03