CVE-2026-4786
Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()
EPSS 0.02%
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.
How to fix CVE-2026-4786
To remediate CVE-2026-4786, upgrade the affected package to a fixed version below.
- Bitnami/libpython—upgrade to 3.14.5 or later
- Bitnami/python—upgrade to 3.14.5 or later
- —upgrade to 3.14.5 or later
- —upgrade to 7.3.22+dfsg-1 or later
- —no fix listed
- —upgrade to 3.14.5-1 or later
Is CVE-2026-4786 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (6)
- from 0, < 3.14.5
- from 0, < 3.14.5
- from 0, < 3.14.5
- from 0, < 7.3.22+dfsg-1
- from 0
- from 0, < 3.14.5-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |