Medium
crun — security advisory
crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun's default device setup opens the container rootfs `/dev` directory without `O_NOFOLLOW`. If an OCI bundle contains `rootfs/dev` as a symlink and the bundle configuration does not mount `/dev`, crun follows that symlink and creates the default device nodes and stdio symlinks at the symlink target outside the container rootfs. In a local rootful crun replay, this created fixed device nodes and symlinks outside the rootfs before crun returned failure. A pre-existing file named `ptmx` in the target directory was also replaced by crun's forced `ptmx -> pts/ptmx` symlink. Version 1.28 fixes the issue.
- Products
- crun
- Affected versions
- 0.10.5+dfsg-1, 0.10.6+dfsg-1, 0.11+dfsg-1, 0.12+dfsg-1, 0.12.1+dfsg-1, 0.17+dfsg-1, 0.17+dfsg-1.1, 0.17+dfsg-1.1ubuntu0.1, 1.11-1, 1.11.1-1, 1.12-1, 1.13-1, 1.14-1, 1.14.1-1, 1.20-1syncable1, 1.21-1ubuntu2, 1.21-1ubuntu3, 1.8.5-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-47766
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:06 UTC · Revision 1
Source evidence
crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun's default device setup opens the container rootfs `/dev` directory without `O_NOFOLLOW`. If an OCI bundle contains `rootfs/dev` as a symlink and the bundle configuration does not mount `/dev`, crun follows that symlink and creates the default device nodes and stdio symlinks at the symlink target outside the container rootfs. In a local rootful crun replay, this created fixed device nodes and symlinks outside the rootfs before crun returned failure. A pre-existing file named `ptmx` in the target directory was also replaced by crun's forced `ptmx -> pts/ptmx` symlink. Version 1.28 fixes the issue.
osv:UBUNTU-CVE-2026-47766
crun
Fixed versions: Not specified
crun
Fixed versions: Not specified
crun
Fixed versions: Not specified
crun
Fixed versions: Not specified
crun
Fixed versions: Not specified
crun
Fixed versions: Not specified
Complete source record
{
"id": "bcf1a56fcac49a58c5d71e6485f50e30ea28f88512b661e6b29a6fa9335ad5d5",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-47766",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-47766",
"summary": "crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun's default device setup opens the container rootfs `/dev` directory without `O_NOFOLLOW`. If an OCI bundle contains `rootfs/dev` as a symlink and the bundle configuration does not mount `/dev`, crun follows that symlink and creates the default device nodes and stdio symlinks at the symlink target outside the container rootfs. In a local rootful crun replay, this created fixed device nodes and symlinks outside the rootfs before crun returned failure. A pre-existing file named `ptmx` in the target directory was also replaced by crun's forced `ptmx -> pts/ptmx` symlink. Version 1.28 fixes the issue.",
"evidence": "osv:UBUNTU-CVE-2026-47766",
"products": [
{
"name": {
"value": "crun",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.10.5+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.10.6+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.11+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.12+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.1+dfsg-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "crun",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.17+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.17+dfsg-1.1",
"evidence": "/affected/1/versions"
},
{
"value": "0.17+dfsg-1.1ubuntu0.1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "crun",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.8.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.11-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.11.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.12-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.13-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.14-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.14.1-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "crun",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.20-1syncable1",
"evidence": "/affected/3/versions"
},
{
"value": "1.21-1ubuntu2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "crun",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.21-1ubuntu3",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "crun",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.21-1ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "1.21-1ubuntu3",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-47766",
"aliases": [
"UBUNTU-CVE-2026-47766"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "crun",
"purl": "pkg:deb/ubuntu/crun?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"0.10.5+dfsg-1",
"0.10.6+dfsg-1",
"0.11+dfsg-1",
"0.12+dfsg-1",
"0.12.1+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47766.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "crun",
"binary_version": "0.12.1+dfsg-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "crun",
"purl": "pkg:deb/ubuntu/crun?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.17+dfsg-1",
"0.17+dfsg-1.1",
"0.17+dfsg-1.1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47766.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "crun",
"binary_version": "0.17+dfsg-1.1ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "crun",
"purl": "pkg:deb/ubuntu/crun?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1.8.5-1",
"1.11-1",
"1.11.1-1",
"1.12-1",
"1.13-1",
"1.14-1",
"1.14.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47766.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "crun",
"binary_version": "1.14.1-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "crun",
"purl": "pkg:deb/ubuntu/crun?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"1.20-1syncable1",
"1.21-1ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47766.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "crun",
"binary_version": "1.21-1ubuntu2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "crun",
"purl": "pkg:deb/ubuntu/crun?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1.21-1ubuntu3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47766.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "crun",
"binary_version": "1.21-1ubuntu3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "crun",
"purl": "pkg:deb/ubuntu/crun?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.21-1ubuntu2",
"1.21-1ubuntu3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47766.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "crun",
"binary_version": "1.21-1ubuntu3"
}
]
}
}
],
"modified": "2026-10-17T13:00:19.805044270Z",
"provider": "osv",
"upstream": [
"CVE-2026-47766"
],
"references": [
"https://ubuntu.com/security/CVE-2026-47766",
"https://www.cve.org/CVERecord?id=CVE-2026-47766",
"https://github.com/containers/crun/security/advisories/GHSA-7vwr-4279-7gq5",
"https://github.com/containers/crun/commit/c6f338ac2e26e216ab7820b91863a0b84e608097"
]
},
"related_cves": [
{
"value": "CVE-2026-47766",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360427,
"published_at": "2026-08-14T17:18:00+00:00"
}