Medium
Security advisory
An issue was discovered in switchGroup() in agent/ExecHelper/ExecHelperMain.cpp in Phusion Passenger before 5.3.2. The set of groups (gidset) is not set correctly, leaving it up to randomness (i.e., uninitialized memory) which supplementary groups are actually being set while lowering privileges.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-12615
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:26 UTC · Revision 1
Source evidence
An issue was discovered in switchGroup() in agent/ExecHelper/ExecHelperMain.cpp in Phusion Passenger before 5.3.2. The set of groups (gidset) is not set correctly, leaving it up to randomness (i.e., uninitialized memory) which supplementary groups are actually being set while lowering privileges.
osv:CVE-2018-12615
Complete source record
{
"id": "bff96cd272d4e797fefced032c15f7262eb19f695bac2511a97a4644ad4684ab",
"url": "https://osv.dev/vulnerability/CVE-2018-12615",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-12615",
"summary": "An issue was discovered in switchGroup() in agent/ExecHelper/ExecHelperMain.cpp in Phusion Passenger before 5.3.2. The set of groups (gidset) is not set correctly, leaving it up to randomness (i.e., uninitialized memory) which supplementary groups are actually being set while lowering privileges.",
"evidence": "osv:CVE-2018-12615",
"products": [],
"severity": "medium",
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"aliases": [
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"GHSA-4284-jfhc-f854"
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"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
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"affected": [
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"database_specific": {
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"vanir_signatures": [
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"source": "https://github.com/phusion/passenger/commit/4e97fdb86d0a0141ec9a052c6e691fcd07bb45c8",
"target": {
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"modified": "2026-10-20T13:32:58.991527630Z",
"provider": "osv",
"references": [
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"source_id": "core-osv",
"document_id": 387825,
"published_at": "2018-06-21T15:29:00.367+00:00"
}