containerd user ID handling bypass allows runAsNonRoot evasion
containerd is an open-source container runtime. In versions prior to 1.7.32, 2.0.9, 2.2.4 and 2.3.1, containers launched with a numeric User directive that cannot be parsed as a 32-bit integer are incorrectly treated as a username, leading to runAsNonRoot evasion. If a crafted image provides an /etc/passwd file mapping this large numeric string to root, the container ultimately runs as root (UID 0). This allows the Kubernetes runAsNonRoot restriction to be bypassed, causing unexpected behavior for environments that require containers to run as a non-root user. This issue has been fixed in versions 1.7.32, 2.0.9, 2.2.4 and 2.3.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-46680
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 21:07 UTC · Revision 1
Source evidence
containerd user ID handling bypass allows runAsNonRoot evasion
core-osv · Original sourcePublished 1 Jul 2026, 17:40 UTC
containerd is an open-source container runtime. In versions prior to 1.7.32, 2.0.9, 2.2.4 and 2.3.1, containers launched with a numeric User directive that cannot be parsed as a 32-bit integer are incorrectly treated as a username, leading to runAsNonRoot evasion. If a crafted image provides an /etc/passwd file mapping this large numeric string to root, the container ultimately runs as root (UID 0). This allows the Kubernetes runAsNonRoot restriction to be bypassed, causing unexpected behavior for environments that require containers to run as a non-root user. This issue has been fixed in versions 1.7.32, 2.0.9, 2.2.4 and 2.3.1.
osv:CVE-2026-46680
Complete source record
{
"id": "6734f66fa11c4507dd43d862c4b39fe6a3c69ebc0491fa0f2329230141f520a3",
"url": "https://osv.dev/vulnerability/CVE-2026-46680",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "containerd user ID handling bypass allows runAsNonRoot evasion",
"summary": "containerd is an open-source container runtime. In versions prior to 1.7.32, 2.0.9, 2.2.4 and 2.3.1, containers launched with a numeric User directive that cannot be parsed as a 32-bit integer are incorrectly treated as a username, leading to runAsNonRoot evasion. If a crafted image provides an /etc/passwd file mapping this large numeric string to root, the container ultimately runs as root (UID 0). This allows the Kubernetes runAsNonRoot restriction to be bypassed, causing unexpected behavior for environments that require containers to run as a non-root user. This issue has been fixed in versions 1.7.32, 2.0.9, 2.2.4 and 2.3.1.",
"evidence": "osv:CVE-2026-46680",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-46680",
"aliases": [
"CVE-2026-46680",
"GHSA-fqw6-gf59-qr4w",
"GO-2026-5378"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
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"repo": "https://github.com/containerd/containerd",
"type": "GIT",
"events": [
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{
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{
"introduced": "061792f0ecf3684fb30a3a0eb006799b8c6638a7"
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{
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{
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{
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"database_specific": {
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"cpe": "cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:*",
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{
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{
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{
"cpe": "cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:*",
"range": [
{
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{
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{
"cpe": "cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:*",
"range": [
{
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{
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]
}
}
],
"versions": [
"api/v1.11.1",
"v2.3.0",
"v2.0.7",
"v1.7.31",
"v2.2.3",
"v2.0.8",
"v2.2.2",
"v1.7.30",
"v2.2.1",
"v1.7.29",
"v2.2.0",
"api/v1.10.0",
"v2.2.0-rc.1",
"v2.2.0-rc.0",
"api/v1.10.0-rc.0",
"v2.2.0-beta.2",
"v2.2.0-beta.1",
"api/v1.10.0-beta.0",
"api/v1.10.0-beta.1",
"v2.2.0-beta.0",
"v1.7.28",
"v2.0.6",
"v2.1.0",
"v2.0.5",
"v1.7.27",
"v2.0.4"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46680.json"
}
}
],
"modified": "2026-10-28T02:30:39.746401089Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46680.json",
"https://github.com/containerd/containerd/security/advisories/GHSA-fqw6-gf59-qr4w",
"https://nvd.nist.gov/vuln/detail/CVE-2026-46680"
],
"provider_metadata": {
"cwe_ids": [
"CWE-269"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46680.json"
}
},
"related_cves": [
{
"value": "CVE-2026-46680",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 507038,
"published_at": "2026-07-01T17:40:25.499+00:00"
}