High
Security advisory
runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-30465
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:16 UTC · Revision 1
Source evidence
runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.
osv:CVE-2021-30465
Complete source record
{
"id": "b36c4f1a100078e6d0dd0f8ae734cdace8306775ad09e67f6efe3bb0329449ee",
"url": "https://osv.dev/vulnerability/CVE-2021-30465",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-30465",
"summary": "runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.",
"evidence": "osv:CVE-2021-30465",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-30465",
"aliases": [
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"GHSA-c3xm-pvg7-gh7r",
"GO-2022-0914"
],
"metrics": [
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"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H"
}
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{
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{
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"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc3:*:*:*:*:*:*",
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{
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc5:*:*:*:*:*:*",
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"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc6:*:*:*:*:*:*",
"range": [
{
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},
{
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],
"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc7:*:*:*:*:*:*",
"range": [
{
"introduced": "1.0.0-rc7"
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{
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"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc8:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc9:*:*:*:*:*:*",
"range": [
{
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{
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc91:*:*:*:*:*:*",
"range": [
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc92:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc93:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:linuxfoundation:runc:1.0.0:rc94:*:*:*:*:*:*",
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{
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"source": "REFERENCES_COMMIT"
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"versions": [
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"1.0.0-rc2",
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"1.0.0-rc4",
"1.0.0-rc5",
"1.0.0-rc6",
"1.0.0-rc7",
"1.0.0-rc8",
"1.0.0-rc9",
"1.0.0-rc91",
"1.0.0-rc92",
"1.0.0-rc93",
"1.0.0-rc94",
"v0.1.1",
"v0.1.0",
"v0.0.8",
"v0.0.7",
"v0.0.6",
"v0.0.5",
"v0.0.4",
"v0.0.2",
"v0.0.3",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-30465.json"
}
}
],
"modified": "2026-10-20T10:53:43.761043317Z",
"provider": "osv",
"references": [
"https://lists.debian.org/debian-lts-announce/2023/03/msg00023.html",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35ZW6NBZSBH5PWIT7JU4HXOXGFVDCOHH/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HOARVIT47RULTTFWAU7XBG4WY6TDDHV/",
"https://github.com/opencontainers/runc/releases",
"https://security.gentoo.org/glsa/202107-26",
"https://security.netapp.com/advisory/ntap-20210708-0003/",
"https://bugzilla.opensuse.org/show_bug.cgi?id=1185405",
"https://github.com/opencontainers/runc/commit/0ca91f44f1664da834bc61115a849b56d22f595f",
"https://github.com/opencontainers/runc/security/advisories/GHSA-c3xm-pvg7-gh7r"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
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"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
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{
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{
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},
"related_cves": [
{
"value": "CVE-2021-30465",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 384550,
"published_at": "2021-05-27T13:15:08.077+00:00"
}