CVE-2026-4519
LOWCVSS 3.3/10EPSS 0.31%
Last modified
CVE-2026-4519 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. 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. EPSS estimates a 0.31% chance of exploitation in the next 30 days.
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().
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Python | Python | < 3.13.13 | — |
| Python | Python | >= 3.14.0, < 3.14.4 | — |
| Python | Python | 3.15.0 | Alpha1 |
References
- https://github.com/python/cpython/issues/143930Issue Tracking, Patch
- https://github.com/python/cpython/pull/143931Issue Tracking, Patch
- https://www.openwall.com/lists/oss-security/2026/03/20/1Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-4519?
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().
How severe is CVE-2026-4519?
CVE-2026-4519 has a CVSS score of 3.3/10 (LOW severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.
How do I fix CVE-2026-4519?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-4519?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST