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().
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
Active
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 9
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Python Python
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
|
— |
3.13.13
|
|
Python Python
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
|
3.14.0
|
3.14.4
|
|
Python Python
cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*
|
— | — |
|
Python Python
cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*
|
— | — |
|
Python Python
cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:*
|
— | — |
|
Python Python
cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:*
|
— | — |
|
Python Python
cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:*
|
— | — |
|
Python Python
cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:*
|
— | — |
|
Python Python
cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:*
|
— | — |
References 16
https://github.com/python/cpython/issues/143930
cna@python.org
https://github.com/python/cpython/pull/143931
cna@python.org
https://mail.python.org/archives/list/security-announce@python.org/thread/AY5ND…
cna@python.org
http://www.openwall.com/lists/oss-security/2026/03/20/1
af854a3a-2127-422b-91ae-364da2661108
https://github.com/python/cpython/commit/43fe06b96f6a6cf5cfd5bdab20b86493749568…
cna@python.org
https://github.com/python/cpython/commit/82a24a4442312bdcfc4c799885e8b3e00990f0…
cna@python.org
https://github.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d…
cna@python.org
https://github.com/python/cpython/commit/ad4d5ba32af4d80b0dfa2ba9d8203bfb219e60…
cna@python.org
https://github.com/python/cpython/commit/ceac1efc66516ac387eef2c9a0ce671895b44f…
cna@python.org
https://github.com/python/cpython/commit/cbba6119391112aba9c5aebf7b94aea447922c…
cna@python.org
https://github.com/python/cpython/commit/3681d47a440865aead912a054d4599087b4270…
cna@python.org
https://github.com/python/cpython/commit/591ed890270c5697b013bf637029fb3e6cd2d7…
cna@python.org
https://github.com/python/cpython/commit/594b5a05dc9913880ac92eded440defbf32a28…
cna@python.org
https://github.com/python/cpython/commit/89bfb8e5ed3c7caa241028f1a4eac5f6275a46…
cna@python.org
https://github.com/python/cpython/commit/96fc5048605863c7b6fd6289643feb0e97edd9…
cna@python.org
https://github.com/python/cpython/commit/cc023511238ad93ecc8796157c6f9139a2bb29…
cna@python.org