USN-8704-1 (UBUNTU-CVE-2026-66484)
Vulnerability from osv_ubuntu – Published: 2026-08-31 13:12 – Updated: 2026-09-01 12:43 – Source website
VLAI
Summary
cpio vulnerabilities
Details
It was discovered that cpio incorrectly sanitized hard-link targets when extracting tar archives in copy-in mode. If a user or automated system were tricked into extracting a specially crafted tar archive, an attacker could possibly use this issue to create hard links to files outside the extraction directory, even when using the --no-absolute-filenames option. (CVE-2026-66484)
It was discovered that cpio did not properly bound the stack memory allocated for pathnames during archive extraction. If a user or automated system were tricked into extracting a specially crafted cpio archive, an attacker could possibly use this issue to cause cpio to crash, resulting in a denial of service. (CVE-2026-66485)
It was discovered that cpio did not properly escape archive member names when listing archive contents. If a user or automated system were tricked into listing a specially crafted archive, an attacker could possibly use this issue to inject misleading output or malicious terminal control sequences. (CVE-2026-66486)
References
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-66484",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66485",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66486",
"severity": [
{
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"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:14.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "cpio",
"binary_version": "2.11+dfsg-1ubuntu1.2+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "cpio",
"purl": "pkg:deb/ubuntu/cpio@2.11+dfsg-1ubuntu1.2+esm3?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.11+dfsg-1ubuntu1.2+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.11+dfsg-1ubuntu1",
"2.11+dfsg-1ubuntu1.1",
"2.11+dfsg-1ubuntu1.2",
"2.11+dfsg-1ubuntu1.2+esm1",
"2.11+dfsg-1ubuntu1.2+esm2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-66484",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66485",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66486",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "cpio",
"binary_version": "2.11+dfsg-5ubuntu1.1+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "cpio",
"purl": "pkg:deb/ubuntu/cpio@2.11+dfsg-5ubuntu1.1+esm2?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.11+dfsg-5ubuntu1.1+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.11+dfsg-4.1ubuntu1",
"2.11+dfsg-5ubuntu1",
"2.11+dfsg-5ubuntu1.1",
"2.11+dfsg-5ubuntu1.1+esm1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-66484",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66485",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66486",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "cpio",
"binary_version": "2.12+dfsg-6ubuntu0.18.04.4+esm1"
},
{
"binary_name": "cpio-win32",
"binary_version": "2.12+dfsg-6ubuntu0.18.04.4+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "cpio",
"purl": "pkg:deb/ubuntu/cpio@2.12+dfsg-6ubuntu0.18.04.4+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.12+dfsg-6ubuntu0.18.04.4+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.11+dfsg-6",
"2.12+dfsg-6",
"2.12+dfsg-6ubuntu0.18.04.1",
"2.12+dfsg-6ubuntu0.18.04.4"
]
},
{
"database_specific": {
"cves_map": {
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{
"id": "CVE-2026-66484",
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{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
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},
{
"id": "CVE-2026-66485",
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{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
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},
{
"id": "CVE-2026-66486",
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"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
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"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "cpio",
"binary_version": "2.13+dfsg-2ubuntu0.4+esm1"
},
{
"binary_name": "cpio-win32",
"binary_version": "2.13+dfsg-2ubuntu0.4+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "cpio",
"purl": "pkg:deb/ubuntu/cpio@2.13+dfsg-2ubuntu0.4+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
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"introduced": "0"
},
{
"fixed": "2.13+dfsg-2ubuntu0.4+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.12+dfsg-9",
"2.12+dfsg-9ubuntu1",
"2.13+dfsg-1",
"2.13+dfsg-2",
"2.13+dfsg-2ubuntu0.3",
"2.13+dfsg-2ubuntu0.4"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-66484",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66485",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66486",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "cpio",
"binary_version": "2.13+dfsg-7ubuntu0.2"
},
{
"binary_name": "cpio-win32",
"binary_version": "2.13+dfsg-7ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "cpio",
"purl": "pkg:deb/ubuntu/cpio@2.13+dfsg-7ubuntu0.2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
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},
{
"fixed": "2.13+dfsg-7ubuntu0.2"
}
],
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}
],
"versions": [
"2.13+dfsg-4ubuntu4",
"2.13+dfsg-7",
"2.13+dfsg-7ubuntu0.1"
]
},
{
"database_specific": {
"cves_map": {
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{
"id": "CVE-2026-66484",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66485",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66486",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "cpio",
"binary_version": "2.15+dfsg-1ubuntu2.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "cpio",
"purl": "pkg:deb/ubuntu/cpio@2.15+dfsg-1ubuntu2.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.13+dfsg-7.1",
"2.14+dfsg-1",
"2.15+dfsg-1",
"2.15+dfsg-1ubuntu1",
"2.15+dfsg-1ubuntu2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-66484",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66485",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-66486",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "cpio",
"binary_version": "2.15+dfsg-2.1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "cpio",
"purl": "pkg:deb/ubuntu/cpio@2.15+dfsg-2.1ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.15+dfsg-2.1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.15+dfsg-2ubuntu1",
"2.15+dfsg-2.1"
]
}
],
"aliases": [],
"details": "It was discovered that cpio incorrectly sanitized hard-link targets when\nextracting tar archives in copy-in mode. If a user or automated system\nwere tricked into extracting a specially crafted tar archive, an attacker\ncould possibly use this issue to create hard links to files outside the\nextraction directory, even when using the --no-absolute-filenames option.\n(CVE-2026-66484)\n\nIt was discovered that cpio did not properly bound the stack memory\nallocated for pathnames during archive extraction. If a user or automated\nsystem were tricked into extracting a specially crafted cpio archive, an\nattacker could possibly use this issue to cause cpio to crash, resulting\nin a denial of service. (CVE-2026-66485)\n\nIt was discovered that cpio did not properly escape archive member names\nwhen listing archive contents. If a user or automated system were tricked\ninto listing a specially crafted archive, an attacker could possibly use\nthis issue to inject misleading output or malicious terminal control\nsequences. (CVE-2026-66486)",
"id": "USN-8704-1",
"modified": "2026-09-01T12:43:24Z",
"published": "2026-08-31T13:12:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8704-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-66484"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-66485"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-66486"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "cpio vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-66484",
"UBUNTU-CVE-2026-66485",
"UBUNTU-CVE-2026-66486"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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