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GHSA-3W57-8XMC-8V26
Vulnerability from github – Published: 2026-09-18 17:17 – Updated: 2026-09-18 17:17
VLAI
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.
Severity
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "anyio"
},
"ranges": [
{
"events": [
{
"introduced": "4.14.0"
},
{
"fixed": "4.14.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-63349"
],
"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"
},
"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\u0027s 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.",
"id": "GHSA-3w57-8xmc-8v26",
"modified": "2026-09-18T17:17:23Z",
"published": "2026-09-18T17:17:23Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/security/advisories/GHSA-3w57-8xmc-8v26"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/pull/1209"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/commit/eb562e6462ee46b1904e50b02ce00a858cdeb200"
},
{
"type": "PACKAGE",
"url": "https://github.com/agronholm/anyio"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/releases/tag/4.14.2"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups"
}
BREW-PROWLER-CVE-2026-63349 (GHSA-3W57-8XMC-8V26)
Vulnerability from osv_homebrew – Published: 2026-09-18 17:39 – Updated: 2026-09-18 17:39 – Source website
VLAI
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.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "anyio",
"resource_purl": "pkg:pypi/anyio@4.15.1",
"upstream_fixed_in": "4.14.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "prowler",
"purl": "pkg:brew/prowler"
},
"ranges": [
{
"events": [
{
"introduced": "5.30.2"
},
{
"fixed": "5.31.1_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/anyio@4.15.1",
"name": "anyio",
"resource": "anyio",
"strategy": "registry",
"subject_version": "4.15.1"
}
]
},
"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\u0027s 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.",
"id": "BREW-prowler-CVE-2026-63349",
"modified": "2026-09-18T17:39:10Z",
"published": "2026-09-18T17:39:10Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/security/advisories/GHSA-3w57-8xmc-8v26"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/pull/1209"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/commit/eb562e6462ee46b1904e50b02ce00a858cdeb200"
},
{
"type": "PACKAGE",
"url": "https://github.com/agronholm/anyio"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/releases/tag/4.14.2"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups",
"upstream": [
"GHSA-3w57-8xmc-8v26",
"CVE-2026-63349"
]
}
BREW-SAFETY-CVE-2026-63349 (GHSA-3W57-8XMC-8V26)
Vulnerability from osv_homebrew – Published: 2026-09-18 18:16 – Updated: 2026-09-18 18:16 – Source website
VLAI
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.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "anyio",
"resource_purl": "pkg:pypi/anyio@4.14.2",
"upstream_fixed_in": "4.14.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "safety",
"purl": "pkg:brew/safety"
},
"ranges": [
{
"events": [
{
"introduced": "3.8.1_1"
},
{
"fixed": "3.8.1_2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/anyio@4.14.2",
"name": "anyio",
"resource": "anyio",
"strategy": "registry",
"subject_version": "4.14.2"
}
]
},
"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\u0027s 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.",
"id": "BREW-safety-CVE-2026-63349",
"modified": "2026-09-18T18:16:14Z",
"published": "2026-09-18T18:16:14Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/security/advisories/GHSA-3w57-8xmc-8v26"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/pull/1209"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/commit/eb562e6462ee46b1904e50b02ce00a858cdeb200"
},
{
"type": "PACKAGE",
"url": "https://github.com/agronholm/anyio"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/releases/tag/4.14.2"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups",
"upstream": [
"GHSA-3w57-8xmc-8v26",
"CVE-2026-63349"
]
}
BREW-SCHEMATHESIS-CVE-20… (GHSA-3W57-8XMC-8V26)
Vulnerability from osv_homebrew – Published: 2026-09-18 18:21 – Updated: 2026-09-18 18:21 – Source website
VLAI
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.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "anyio",
"resource_purl": "pkg:pypi/anyio@4.15.1",
"upstream_fixed_in": "4.14.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "schemathesis",
"purl": "pkg:brew/schemathesis"
},
"ranges": [
{
"events": [
{
"introduced": "4.21.8"
},
{
"fixed": "4.23.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/anyio@4.15.1",
"name": "anyio",
"resource": "anyio",
"strategy": "registry",
"subject_version": "4.15.1"
}
]
},
"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\u0027s 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.",
"id": "BREW-schemathesis-CVE-2026-63349",
"modified": "2026-09-18T18:21:12Z",
"published": "2026-09-18T18:21:12Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/security/advisories/GHSA-3w57-8xmc-8v26"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/pull/1209"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/commit/eb562e6462ee46b1904e50b02ce00a858cdeb200"
},
{
"type": "PACKAGE",
"url": "https://github.com/agronholm/anyio"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/releases/tag/4.14.2"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups",
"upstream": [
"GHSA-3w57-8xmc-8v26",
"CVE-2026-63349"
]
}
BREW-SYSAIDMIN-CVE-2026-63349 (GHSA-3W57-8XMC-8V26)
Vulnerability from osv_homebrew – Published: 2026-09-18 18:57 – Updated: 2026-09-18 18:57 – Source website
VLAI
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.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "anyio",
"resource_purl": "pkg:pypi/anyio@4.14.2",
"upstream_fixed_in": "4.14.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "sysaidmin",
"purl": "pkg:brew/sysaidmin"
},
"ranges": [
{
"events": [
{
"introduced": "0.2.5_18"
},
{
"fixed": "0.2.5_19"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/anyio@4.14.2",
"name": "anyio",
"resource": "anyio",
"strategy": "registry",
"subject_version": "4.14.2"
}
]
},
"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\u0027s 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.",
"id": "BREW-sysaidmin-CVE-2026-63349",
"modified": "2026-09-18T18:57:50Z",
"published": "2026-09-18T18:57:50Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/security/advisories/GHSA-3w57-8xmc-8v26"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/pull/1209"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/commit/eb562e6462ee46b1904e50b02ce00a858cdeb200"
},
{
"type": "PACKAGE",
"url": "https://github.com/agronholm/anyio"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/releases/tag/4.14.2"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups",
"upstream": [
"GHSA-3w57-8xmc-8v26",
"CVE-2026-63349"
]
}
BREW-YEWTUBE-CVE-2026-63349 (GHSA-3W57-8XMC-8V26)
Vulnerability from osv_homebrew – Published: 2026-09-18 19:37 – Updated: 2026-09-18 19:37 – Source website
VLAI
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.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "anyio",
"resource_purl": "pkg:pypi/anyio@4.15.1",
"upstream_fixed_in": "4.14.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "yewtube",
"purl": "pkg:brew/yewtube"
},
"ranges": [
{
"events": [
{
"introduced": "2.13.1_3"
},
{
"fixed": "2.13.1_4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/anyio@4.15.1",
"name": "anyio",
"resource": "anyio",
"strategy": "registry",
"subject_version": "4.15.1"
}
]
},
"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\u0027s 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.",
"id": "BREW-yewtube-CVE-2026-63349",
"modified": "2026-09-18T19:37:42Z",
"published": "2026-09-18T19:37:42Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/security/advisories/GHSA-3w57-8xmc-8v26"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/pull/1209"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/commit/eb562e6462ee46b1904e50b02ce00a858cdeb200"
},
{
"type": "PACKAGE",
"url": "https://github.com/agronholm/anyio"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/releases/tag/4.14.2"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups",
"upstream": [
"GHSA-3w57-8xmc-8v26",
"CVE-2026-63349"
]
}
BREW-ZABBIX-CLI-CVE-2026-63349 (GHSA-3W57-8XMC-8V26)
Vulnerability from osv_homebrew – Published: 2026-09-18 19:40 – Updated: 2026-09-18 19:40 – Source website
VLAI
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.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": null,
"range_state": "affected",
"resource": "anyio",
"resource_purl": "pkg:pypi/anyio@4.14.0",
"upstream_fixed_in": "4.14.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "zabbix-cli",
"purl": "pkg:brew/zabbix-cli"
},
"ranges": [
{
"events": [
{
"introduced": "3.7.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/anyio@4.14.0",
"name": "anyio",
"resource": "anyio",
"strategy": "registry",
"subject_version": "4.14.0"
}
]
},
"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\u0027s 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.",
"id": "BREW-zabbix-cli-CVE-2026-63349",
"modified": "2026-09-18T19:40:19Z",
"published": "2026-09-18T19:40:19Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/security/advisories/GHSA-3w57-8xmc-8v26"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/pull/1209"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/commit/eb562e6462ee46b1904e50b02ce00a858cdeb200"
},
{
"type": "PACKAGE",
"url": "https://github.com/agronholm/anyio"
},
{
"type": "WEB",
"url": "https://github.com/agronholm/anyio/releases/tag/4.14.2"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups",
"upstream": [
"GHSA-3w57-8xmc-8v26",
"CVE-2026-63349"
]
}
CVE-2026-63349 (GCVE-0-2026-63349)
Vulnerability from cvelistv5 – Published: 2026-09-18 17:02 – Updated: 2026-09-18 17:02
VLAI
EPSS
VEX
Title
AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups
Summary
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.
Severity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/agronholm/anyio/security/advis… | x_refsource_CONFIRM |
| https://github.com/agronholm/anyio/pull/1209 | x_refsource_MISC |
| https://github.com/agronholm/anyio/commit/eb562e6… | x_refsource_MISC |
| https://github.com/agronholm/anyio/releases/tag/4.14.2 | x_refsource_MISC |
{
"containers": {
"cna": {
"affected": [
{
"product": "anyio",
"vendor": "agronholm",
"versions": [
{
"status": "affected",
"version": "\u003e= 4.14.0, \u003c 4.14.2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"attackVector": "LOCAL",
"baseScore": 7,
"baseSeverity": "HIGH",
"privilegesRequired": "HIGH",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-266",
"description": "CWE-266: Incorrect Privilege Assignment",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-269",
"description": "CWE-269: Improper Privilege Management",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-18T17:02:30.273Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/agronholm/anyio/security/advisories/GHSA-3w57-8xmc-8v26",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/agronholm/anyio/security/advisories/GHSA-3w57-8xmc-8v26"
},
{
"name": "https://github.com/agronholm/anyio/pull/1209",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/agronholm/anyio/pull/1209"
},
{
"name": "https://github.com/agronholm/anyio/commit/eb562e6462ee46b1904e50b02ce00a858cdeb200",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/agronholm/anyio/commit/eb562e6462ee46b1904e50b02ce00a858cdeb200"
},
{
"name": "https://github.com/agronholm/anyio/releases/tag/4.14.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/agronholm/anyio/releases/tag/4.14.2"
}
],
"source": {
"advisory": "GHSA-3w57-8xmc-8v26",
"discovery": "UNKNOWN"
},
"title": "AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-63349",
"datePublished": "2026-09-18T17:02:30.273Z",
"dateReserved": "2026-07-16T14:14:24.386Z",
"dateUpdated": "2026-09-18T17:02:30.273Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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