CVE-2026-4519
LOWCVSS v3.1: 3.3 · EPSS: 0.0003 (10.0 percentile)
Source data as of:
At a glance
- Severity
- LOW
- CVSS
- 3.3 v3.1 · NVD
- EPSS
- 0.0003 (10.0 percentile) · FIRST.org
- CISA KEV
- No
- Type
- Improper Input Validation · NVD CWE
- Attack conditions (CVSS vector)
- No privileges · Source: NVD Vector
- Affected vendors
- python
- Published
- 2026-03-20 · Modified: 2026-04-16
- References
- Jump to references (8)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
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().
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.
- Patch https://github.com/python/cpython/commit/3681d47a440865aead912a054d4599087b4270dd
- Patch https://github.com/python/cpython/commit/43fe06b96f6a6cf5cfd5bdab20b8649374956866
- Patch https://github.com/python/cpython/commit/591ed890270c5697b013bf637029fb3e6cd2d73e
- Patch https://github.com/python/cpython/commit/594b5a05dc9913880ac92eded440defbf32a28d1
- Patch https://github.com/python/cpython/commit/82a24a4442312bdcfc4c799885e8b3e00990f02b
- Patch https://github.com/python/cpython/commit/89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4
- Patch https://github.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d76
- Patch https://github.com/python/cpython/commit/96fc5048605863c7b6fd6289643feb0e97edd96c