CVE-2026-4519
Low
Description
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().
SeverityLow
CVSS3.3
Exploit probability—
Product
Python
PublishedMar 20, 2026
First seenMar 20, 2026
Weakness typeCWE-20Improper input validationCWE-88CWE-88
How to fix
Update
- python python3.13.13, 3.14.4 or later
Patches
- github.com/python/cpython/pull/143931
- github.com/python/cpython/commit/43fe06b96f6a6cf5cfd5bdab20b8649374956866
- github.com/python/cpython/commit/82a24a4442312bdcfc4c799885e8b3e00990f02b
- github.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d76
- github.com/python/cpython/commit/ad4d5ba32af4d80b0dfa2ba9d8203bfb219e60a5
- github.com/python/cpython/commit/ceac1efc66516ac387eef2c9a0ce671895b44f03
- github.com/python/cpython/commit/cbba6119391112aba9c5aebf7b94aea447922c48
- github.com/python/cpython/commit/3681d47a440865aead912a054d4599087b4270dd
- github.com/python/cpython/commit/591ed890270c5697b013bf637029fb3e6cd2d73e
- github.com/python/cpython/commit/594b5a05dc9913880ac92eded440defbf32a28d1
- github.com/python/cpython/commit/89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python python | v < 3.13.13, 3.14.0 ≤ v < 3.14.4, 3.15.0 | 3.13.13, 3.14.4 |
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