CVE-2026-4786
High
Description
Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the mitigation could be bypassed for certain browser types the "webbrowser.open()" API could have commands injected into the underlying shell. See CVE-2026-4519 for details.
SeverityHigh
CVSS7.1
Exploit probability—
ProductCPython
PublishedApr 13, 2026
First seenApr 13, 2026
Weakness typeCWE-77Command injection
How to fix
Update
- Python Software Foundation CPython3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.5rc1, 3.15.0b1 or later
Patches
- github.com/python/cpython/pull/148170
- github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bca
- github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fff
- github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769
- github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53
- github.com/python/cpython/commit/d6d68494be70bdbda20f89f83801ba52ec37daa4
- github.com/python/cpython/commit/a4d3edf3a6ecfde504d02126410d2a65a859b744
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Python Software Foundation CPython | v < 3.10.21, 3.11.0 ≤ v < 3.11.16, 3.12.0 ≤ v < 3.12.14, 3.13.0 ≤ v < 3.13.14, 3.14.0a1 ≤ v < 3.14.5rc1, 3.15.0a1 ≤ v < 3.15.0b1 | 3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.5rc1, 3.15.0b1 |
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