cups — security advisory
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, copy_model() in scheduler/ipp.c creates a predictable TempDir/.ppd path in an lp-group-writable directory and opens it as root without O_EXCL or O_NOFOLLOW. Exploitation requires an lp-group process able to write that directory to predict the connection-derived name and plant a symlink before the root open, while a privileged add-printer or modify-printer operation using a model PPD triggers copy_model(). The reporter treats an existing lp foothold and the privileged operation as distinct prerequisites, while the maintainer assesses high privileges because installing the relevant filter or administering the printer requires root or print-administrator access. If the race succeeds, the root scheduler follows the symlink and truncates or overwrites a root-writable target with generated PPD data, compromising file integrity or availability. This issue is fixed in version 2.4.20.
- Products
- cups
- Affected versions
- 2.4.10-1, 2.4.10-2, 2.4.10-3, 2.4.10-3+deb13u1, 2.4.10-3+deb13u2, 2.4.10-4, 2.4.14-1, 2.4.15-1, 2.4.16-1, 2.4.17-1, 2.4.18-1, 2.4.2-3, 2.4.2-3+deb12u1, 2.4.2-3+deb12u2, 2.4.2-3+deb12u3, 2.4.2-3+deb12u4, 2.4.2-3+deb12u5, 2.4.2-3+deb12u6, 2.4.2-3+deb12u7, 2.4.2-3+deb12u8, 2.4.2-3+deb12u9, 2.4.2-4, 2.4.2-5, 2.4.2-6, 2.4.20-1, 2.4.7-1, 2.4.7-1.1, 2.4.7-1.2, 2.4.7-2, 2.4.7-3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-55480
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:28 UTC · Revision 1
Source evidence
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, copy_model() in scheduler/ipp.c creates a predictable TempDir/.ppd path in an lp-group-writable directory and opens it as root without O_EXCL or O_NOFOLLOW. Exploitation requires an lp-group process able to write that directory to predict the connection-derived name and plant a symlink before the root open, while a privileged add-printer or modify-printer operation using a model PPD triggers copy_model(). The reporter treats an existing lp foothold and the privileged operation as distinct prerequisites, while the maintainer assesses high privileges because installing the relevant filter or administering the printer requires root or print-administrator access. If the race succeeds, the root scheduler follows the symlink and truncates or overwrites a root-writable target with generated PPD data, compromising file integrity or availability. This issue is fixed in version 2.4.20.
osv:DEBIAN-CVE-2026-55480
cups
Fixed versions: Not specified
cups
Fixed versions: Not specified
cups
Fixed versions: Not specified
Complete source record
{
"id": "9b4f20b096bca34f42b7331a3d39f9b70ed7a2b4f37b51999aa60bff05b9ce33",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-55480",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-55480",
"summary": "OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, copy_model() in scheduler/ipp.c creates a predictable TempDir/.ppd path in an lp-group-writable directory and opens it as root without O_EXCL or O_NOFOLLOW. Exploitation requires an lp-group process able to write that directory to predict the connection-derived name and plant a symlink before the root open, while a privileged add-printer or modify-printer operation using a model PPD triggers copy_model(). The reporter treats an existing lp foothold and the privileged operation as distinct prerequisites, while the maintainer assesses high privileges because installing the relevant filter or administering the printer requires root or print-administrator access. If the race succeeds, the root scheduler follows the symlink and truncates or overwrites a root-writable target with generated PPD data, compromising file integrity or availability. This issue is fixed in version 2.4.20.",
"evidence": "osv:DEBIAN-CVE-2026-55480",
"products": [
{
"name": {
"value": "cups",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.4.10-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.10-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.10-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.10-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.14-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.15-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.17-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.18-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3+deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3+deb12u4",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3+deb12u5",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3+deb12u6",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3+deb12u7",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3+deb12u8",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-3+deb12u9",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-5",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.2-6",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.20-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.7-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.7-1.2",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.7-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.7-3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "cups",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.4.10-3",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.10-3+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.10-3+deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.10-4",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.14-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.15-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.16-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.17-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.18-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.20-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "cups",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.4.10-3",
"evidence": "/affected/2/versions"
},
{
"value": "2.4.10-4",
"evidence": "/affected/2/versions"
},
{
"value": "2.4.14-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.4.15-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.4.16-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.4.17-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.4.18-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.4.20-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-55480",
"aliases": [
"DEBIAN-CVE-2026-55480"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cups",
"purl": "pkg:deb/debian/cups?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.4.10-1",
"2.4.10-2",
"2.4.10-3",
"2.4.10-4",
"2.4.14-1",
"2.4.15-1",
"2.4.16-1",
"2.4.17-1",
"2.4.18-1",
"2.4.2-3",
"2.4.2-3+deb12u1",
"2.4.2-3+deb12u2",
"2.4.2-3+deb12u3",
"2.4.2-3+deb12u4",
"2.4.2-3+deb12u5",
"2.4.2-3+deb12u6",
"2.4.2-3+deb12u7",
"2.4.2-3+deb12u8",
"2.4.2-3+deb12u9",
"2.4.2-4",
"2.4.2-5",
"2.4.2-6",
"2.4.20-1",
"2.4.7-1",
"2.4.7-1.1",
"2.4.7-1.2",
"2.4.7-2",
"2.4.7-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55480.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cups",
"purl": "pkg:deb/debian/cups?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.4.10-3",
"2.4.10-3+deb13u1",
"2.4.10-3+deb13u2",
"2.4.10-4",
"2.4.14-1",
"2.4.15-1",
"2.4.16-1",
"2.4.17-1",
"2.4.18-1",
"2.4.20-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55480.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cups",
"purl": "pkg:deb/debian/cups?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.4.10-3",
"2.4.10-4",
"2.4.14-1",
"2.4.15-1",
"2.4.16-1",
"2.4.17-1",
"2.4.18-1",
"2.4.20-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55480.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T17:47:44.679365634Z",
"provider": "osv",
"upstream": [
"CVE-2026-55480"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-55480"
]
},
"related_cves": [
{
"value": "CVE-2026-55480",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 418677,
"published_at": "2026-10-15T18:17:27.987+00:00"
}