CVE-2026-63349

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Source
https://cve.org/CVERecord?id=CVE-2026-63349
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63349.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63349
Aliases
Downstream
Published
2026-09-18T17:02:30Z
Modified
2026-09-19T03:45:58Z
Severity
  • 7.0 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups
Details

AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. In 4.14.0, AnyIO accepts the POSIX extra_groups argument in anyio.run_process() and anyio.open_process(), but open_process() forwards the group argument to the backend instead of extra_groups. A caller that supplies extra_groups=[] to clear inherited supplementary groups can therefore launch a child that retains the parent process groups, undermining a privilege-dropping boundary. If group is also supplied, the integer group value is passed where an iterable of supplementary groups is expected and the launch can fail with TypeError. This issue affects POSIX applications that rely on AnyIO subprocess helpers to launch less-privileged child processes. This issue is fixed in version 4.14.2.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-266",
        "CWE-269"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63349.json"
}
References

Affected packages

Git / github.com/agronholm/anyio

Affected ranges

Type
GIT
Repo
https://github.com/agronholm/anyio
Events
Introduced
ffe91331adb912c5d150f5d373f7cd28a0e96a62
Fixed
c384f99687c64c59ed8a11c3a0f11a2d57daff71
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "4.14.0"
        },
        {
            "fixed": "4.14.2"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

4.*
4.14.0
4.14.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63349.json"