LowFix available
runc — security advisory
runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.
- Products
- runc
- Affected versions
- 1.1.10+ds1-1, 1.1.12+ds1-1, 1.1.12+ds1-2, 1.1.12+ds1-3, 1.1.12+ds1-4, 1.1.12+ds1-5, 1.1.12+ds1-5.1, 1.1.15+ds1-1, 1.1.15+ds1-2, 1.1.5+ds1-1, 1.1.5+ds1-1+deb12u1, 1.1.5+ds1-2, 1.1.5+ds1-3, 1.1.5+ds1-4, 1.1.5+ds1-5, 1.3.0+ds1-1, 1.3.0+ds1-2, 1.3.0+ds1-3, 1.3.0+ds1-4, 1.3.2+ds1-1, 1.3.3+ds1-1, 1.3.3+ds1-2, 1.3.3+ds1-3, 1.3.5+ds1-1, 1.3.6+ds1-1, 1.4.3+ds1-1
- Fixed versions
- 1.3.6+ds1-1
- CVEs
- CVE-2026-41579
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:21 UTC · Revision 2
Source evidence
runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.
osv:DEBIAN-CVE-2026-41579
runc
Fixed versions: Not specified
runc
Fixed versions: Not specified
runc
Fixed versions: 1.3.6+ds1-1
Complete source record
{
"id": "3cfec1529ac29b82dad07745a0098b1af5428a54c5a1d89cb2cb60ce4cf5fda6",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-41579",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-41579",
"summary": "runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.",
"evidence": "osv:DEBIAN-CVE-2026-41579",
"products": [
{
"name": {
"value": "runc",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.1.10+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.12+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.12+ds1-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.12+ds1-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.12+ds1-4",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.12+ds1-5",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.12+ds1-5.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.15+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.15+ds1-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.5+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.5+ds1-1+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.5+ds1-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.5+ds1-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.5+ds1-4",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.5+ds1-5",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0+ds1-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0+ds1-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0+ds1-4",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.2+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.3+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.3+ds1-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.3+ds1-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.5+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.6+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.3+ds1-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "runc",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.1.15+ds1-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.0+ds1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.0+ds1-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.0+ds1-3",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.0+ds1-4",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.2+ds1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.3+ds1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.3+ds1-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.3+ds1-3",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.5+ds1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+ds1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.4.3+ds1-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "runc",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.3.6+ds1-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1.1.15+ds1-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.0+ds1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.0+ds1-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.0+ds1-3",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.0+ds1-4",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.2+ds1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.3+ds1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.3+ds1-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.3+ds1-3",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.5+ds1-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "low",
"structured": {
"id": "DEBIAN-CVE-2026-41579",
"aliases": [
"DEBIAN-CVE-2026-41579"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "runc",
"purl": "pkg:deb/debian/runc?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.1.10+ds1-1",
"1.1.12+ds1-1",
"1.1.12+ds1-2",
"1.1.12+ds1-3",
"1.1.12+ds1-4",
"1.1.12+ds1-5",
"1.1.12+ds1-5.1",
"1.1.15+ds1-1",
"1.1.15+ds1-2",
"1.1.5+ds1-1",
"1.1.5+ds1-1+deb12u1",
"1.1.5+ds1-2",
"1.1.5+ds1-3",
"1.1.5+ds1-4",
"1.1.5+ds1-5",
"1.3.0+ds1-1",
"1.3.0+ds1-2",
"1.3.0+ds1-3",
"1.3.0+ds1-4",
"1.3.2+ds1-1",
"1.3.3+ds1-1",
"1.3.3+ds1-2",
"1.3.3+ds1-3",
"1.3.5+ds1-1",
"1.3.6+ds1-1",
"1.4.3+ds1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41579.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "runc",
"purl": "pkg:deb/debian/runc?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.1.15+ds1-2",
"1.3.0+ds1-1",
"1.3.0+ds1-2",
"1.3.0+ds1-3",
"1.3.0+ds1-4",
"1.3.2+ds1-1",
"1.3.3+ds1-1",
"1.3.3+ds1-2",
"1.3.3+ds1-3",
"1.3.5+ds1-1",
"1.3.6+ds1-1",
"1.4.3+ds1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41579.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.3.6+ds1-1"
}
]
}
],
"package": {
"name": "runc",
"purl": "pkg:deb/debian/runc?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.1.15+ds1-2",
"1.3.0+ds1-1",
"1.3.0+ds1-2",
"1.3.0+ds1-3",
"1.3.0+ds1-4",
"1.3.2+ds1-1",
"1.3.3+ds1-1",
"1.3.3+ds1-2",
"1.3.3+ds1-3",
"1.3.5+ds1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41579.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T11:47:35.870848708Z",
"provider": "osv",
"upstream": [
"CVE-2026-41579"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-41579"
]
},
"related_cves": [
{
"value": "CVE-2026-41579",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450905,
"published_at": "2026-07-01T02:17:00.193+00:00"
}