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Low 3.3Published Mar 20, 2026
CVE-2026-4519The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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().
- CVSS
- 3.3 LOW (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-20, CWE-88
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Aug 13, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
python python python:python | before 3.13.13; from 3.14.0 before 3.14.4; 3.15.0; 3.15.0; 3.15.0; 3.15.0; 3.15.0; 3.15.0; and 1 more ranges | NVD |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.