CVE-2026-4519
Published: March 21, 2026Last modified: March 28, 2026
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().
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 3.3 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | LOW |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | python3 | Fixed (3.11.15-r1) |
| 25 LTS | python3 | Fixed (3.12.13-r1) | |
| Stream | python3 | Fixed (3.12.13-r1) | |
| Hardened Containers | 23 LTS | python3 | Fixed (3.11.15-r1) |
| 25 LTS | python3 | Fixed (3.12.13-r1) | |
| Stream | python3 | Fixed (3.12.13-r1) |
References
- http://www.openwall.com/lists/oss-security/2026/03/20/1
- 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
- https://github.com/python/cpython/issues/143930
- https://github.com/python/cpython/pull/143931
- https://mail.python.org/archives/list/[email protected]/thread/AY5NDSS433JK56Q7Q5IS7B37QFZVVOUS/