GHSA-3w57-8xmc-8v26
Suggest an improvement- Source
- https://github.com/advisories/GHSA-3w57-8xmc-8v26
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-3w57-8xmc-8v26/GHSA-3w57-8xmc-8v26.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-3w57-8xmc-8v26
- Aliases
- Downstream
- Published
- 2026-09-18T17:17:23Z
- Modified
- 2026-09-18T17:30:08Z
- 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 4.14.0 accepts the POSIX extra_groups argument on anyio.run_process() and anyio.open_process(), but open_process() forwards the wrong variable to the backend: when extra_groups is not None, it assigns kwargs["extra_groups"] = group instead of extra_groups. As a result, callers cannot reliably clear or set supplementary groups for child processes. In a disposable Linux container, Python's subprocess.run(..., extra_groups=[]) clears a synthetic parent supplementary group list, while anyio.run_process(..., extra_groups=[]) preserves the parent groups. If group is also supplied, AnyIO passes an integer as extra_groups and the call fails with TypeError. This is a POSIX privilege-dropping correctness issue for applications that rely on AnyIO subprocess helpers to launch less-privileged child processes.
- Database specific
{ "cwe_ids": [ "CWE-266", "CWE-269" ], "github_reviewed": true, "github_reviewed_at": "2026-09-18T17:17:23Z", "nvd_published_at": null, "severity": "HIGH" }- References
Affected packages
PyPI / anyio
Package
- Name
- anyio
- View open source insights on deps.dev
- Purl
- pkg:pypi/anyio