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
CVSS 3.1 3.3/10
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Python Software Foundation | CPython | < 3.10.21; >= 3.11.0, < 3.11.16; >= 3.12.0, < 3.12.14; >= 3.13.0, < 3.13.13; >= 3.14.0, < 3.14.4; >= 3.15.0a1, < 3.15.0a8 |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | — |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8.2 Advanced Update Support | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — |
| Red Hat | RHEL-8 based Middleware Containers | — |
| Red Hat | RHEL-8 based Middleware Containers | — |
| Red Hat | RHEL-8 based Middleware Containers | — |
| Red Hat | RHEL-8 based Middleware Containers | — |
| Red Hat | RHEL-8 based Middleware Containers | — |
| Red Hat | RHEL-8 based Middleware Containers | — |
| Red Hat | RHEL-8 based Middleware Containers | — |
| Red Hat | Red Hat AI Inference Server 3.2 | — |
| Red Hat | Red Hat AI Inference Server 3.2 | — |
| Red Hat | Red Hat AI Inference Server 3.2 | — |
| Red Hat | Red Hat AI Inference Server 3.3 | — |
| Red Hat | Red Hat AI Inference Server 3.3 | — |
| Red Hat | Red Hat AI Inference Server 3.3 | — |
| Red Hat | Red Hat AI Inference Server 3.3 | — |
| Red Hat | Red Hat Discovery 2 | — |
| Red Hat | Red Hat Enterprise Linux AI 3.3 | — |
| Red Hat | Red Hat Enterprise Linux AI 3.3 | — |
References
- https://github.com/python/cpython/commit/3681d47a440865aead912a054d4599087b4270ddPatch
- https://github.com/python/cpython/commit/43fe06b96f6a6cf5cfd5bdab20b8649374956866Patch
- https://github.com/python/cpython/commit/591ed890270c5697b013bf637029fb3e6cd2d73ePatch
- https://github.com/python/cpython/commit/594b5a05dc9913880ac92eded440defbf32a28d1Patch
- https://github.com/python/cpython/commit/82a24a4442312bdcfc4c799885e8b3e00990f02bPatch
- https://github.com/python/cpython/commit/89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4Patch
- https://github.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d76Patch
- https://github.com/python/cpython/commit/96fc5048605863c7b6fd6289643feb0e97edd96cPatch
- https://github.com/python/cpython/commit/ad4d5ba32af4d80b0dfa2ba9d8203bfb219e60a5Patch
- https://github.com/python/cpython/commit/cbba6119391112aba9c5aebf7b94aea447922c48Patch
- https://github.com/python/cpython/commit/cc023511238ad93ecc8796157c6f9139a2bb2932Patch
- https://github.com/python/cpython/commit/ceac1efc66516ac387eef2c9a0ce671895b44f03Patch
- https://github.com/python/cpython/issues/143930Issue Tracking, Patch
- https://github.com/python/cpython/pull/143931Issue Tracking, Patch
- https://mail.python.org/archives/list/security-announce@python.org/thread/AY5NDSS433JK56Q7Q5IS7B37QFZVVOUS/Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/03/20/1Mailing List, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:10065
- https://access.redhat.com/errata/RHSA-2026:10101
- https://access.redhat.com/errata/RHSA-2026:10102
- https://access.redhat.com/errata/RHSA-2026:10111
- https://access.redhat.com/errata/RHSA-2026:10140
- https://access.redhat.com/errata/RHSA-2026:10141
- https://access.redhat.com/errata/RHSA-2026:13812
- https://access.redhat.com/errata/RHSA-2026:16008
- https://access.redhat.com/errata/RHSA-2026:16009
- https://access.redhat.com/errata/RHSA-2026:16030
- https://access.redhat.com/errata/RHSA-2026:16174
- https://access.redhat.com/errata/RHSA-2026:19019
- https://access.redhat.com/errata/RHSA-2026:19064
- https://access.redhat.com/errata/RHSA-2026:19175
- https://access.redhat.com/errata/RHSA-2026:19176
- https://access.redhat.com/errata/RHSA-2026:19177
- https://access.redhat.com/errata/RHSA-2026:19216
- https://access.redhat.com/errata/RHSA-2026:19724
- https://access.redhat.com/errata/RHSA-2026:19725
- https://access.redhat.com/errata/RHSA-2026:21275
- https://access.redhat.com/errata/RHSA-2026:25096
- https://access.redhat.com/errata/RHSA-2026:6016
- https://access.redhat.com/errata/RHSA-2026:6035
- https://access.redhat.com/errata/RHSA-2026:6256
- https://access.redhat.com/errata/RHSA-2026:6281
- https://access.redhat.com/errata/RHSA-2026:6283
- https://access.redhat.com/errata/RHSA-2026:6285
- https://access.redhat.com/errata/RHSA-2026:6286
- https://access.redhat.com/errata/RHSA-2026:6473
- https://access.redhat.com/errata/RHSA-2026:6766
- https://access.redhat.com/errata/RHSA-2026:7010
- https://access.redhat.com/errata/RHSA-2026:7244
- https://access.redhat.com/errata/RHSA-2026:7329
- https://access.redhat.com/errata/RHSA-2026:7335
- https://access.redhat.com/errata/RHSA-2026:7443
- https://access.redhat.com/errata/RHSA-2026:7661
- https://access.redhat.com/errata/RHSA-2026:8746
- https://access.redhat.com/errata/RHSA-2026:8747
- https://access.redhat.com/errata/RHSA-2026:8748
- https://access.redhat.com/errata/RHSA-2026:9042
- https://access.redhat.com/errata/RHSA-2026:9260
- https://access.redhat.com/errata/RHSA-2026:9261
- https://access.redhat.com/errata/RHSA-2026:9262
- https://access.redhat.com/errata/RHSA-2026:9289
Timeline
- Published
- Mar 20, 2026
- Last modified
- Aug 13, 2026
- NVD status
- Modified