CVE-2026-4786

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Source
https://cve.org/CVERecord?id=CVE-2026-4786
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4786.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-4786
Aliases
Downstream
Related
Published
2026-04-13T21:52:19.036Z
Modified
2026-08-14T03:51:34.843379929Z
Severity
  • 7.0 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()
Details

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.

Database specific 
{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "fixed": "3.10.21"
                },
                {
                    "introduced": "3.11.0"
                },
                {
                    "fixed": "3.11.16"
                },
                {
                    "introduced": "3.12.0"
                },
                {
                    "fixed": "3.12.14"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ],
    "cwe_ids": [
        "CWE-77"
    ],
    "cna_assigner": "PSF",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4786.json"
}
References

Affected packages

Git / github.com/python/cpython

Affected ranges

Type
GIT
Repo
https://github.com/python/cpython
Events
Introduced
60403a5409ff2c3f3b07dd2ca91a7a3e096839c7
Introduced
b092705907c758d4f9742028652c9802f9f03dd3
Introduced
f31a89bb901067dd105b00cfa90523cf7ffdbbdd
Fixed
fd17997c3866d61e0e7bd8201b1d8f35b40a40bd
Fixed
a68a9190498a16ab1a5c9012ef5a70df81a5b328
Fixed
f31a89bb901067dd105b00cfa90523cf7ffdbbdd
Fixed
28b4ad38067bbdad34edfcd03ad2de5f06387e53
Fixed
a4d3edf3a6ecfde504d02126410d2a65a859b744
Fixed
c5767a72838a8dda9d6dc5d3558075b055c56bca
Fixed
d22922c8a7958353689dc4763dd72da2dea03fff
Fixed
d6d68494be70bdbda20f89f83801ba52ec37daa4
Fixed
f4654824ae0850ac87227fb270f9057477946769
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "3.13.0"
        },
        {
            "fixed": "3.13.14"
        },
        {
            "introduced": "3.14.0a1"
        },
        {
            "fixed": "3.14.5rc1"
        },
        {
            "introduced": "3.15.0a1"
        },
        {
            "fixed": "3.15.0b1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v3.*
v3.13.0
v3.13.1
v3.13.10
v3.13.11
v3.13.12
v3.13.13
v3.13.2
v3.13.3
v3.13.4
v3.13.5
v3.13.6
v3.13.7
v3.13.8
v3.14.0
v3.14.0b1
v3.14.0b2
v3.14.0b3
v3.14.0b4
v3.14.0rc1
v3.14.0rc2
v3.14.0rc3
v3.14.1
v3.14.2
v3.14.3
v3.14.4
v3.15.0a1
v3.15.0a2
v3.15.0a3
v3.15.0a4
v3.15.0a5
v3.15.0a6
v3.15.0a7
v3.15.0a8

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4786.json"