USN-8477-2 (UBUNTU-CVE-2026-5704)
Vulnerability from osv_ubuntu – Published: 2026-07-16 20:05 – Updated: 2026-07-16 20:05 – Source website
VLAI
Summary
tar regression
Details
USN-8477-1 fixed a vulnerability in tar. The update introduced a regression that could cause tar to fail to extract certain valid files. This update fixes the problem.
Original advisory details:
It was discovered that tar incorrectly handled certain crafted archive files. An attacker could possibly use this to inject hidden files with attacker-controlled content, bypassing pre-extraction inspection mechanisms.
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-5704",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"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": "tar",
"binary_version": "1.27.1-1ubuntu0.1+esm6"
},
{
"binary_name": "tar-scripts",
"binary_version": "1.27.1-1ubuntu0.1+esm6"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "tar",
"purl": "pkg:deb/ubuntu/tar@1.27.1-1ubuntu0.1+esm6?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.27.1-1ubuntu0.1+esm6"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.26+dfsg-8",
"1.27-3",
"1.27-4",
"1.27.1-1",
"1.27.1-1ubuntu0.1",
"1.27.1-1ubuntu0.1+esm1",
"1.27.1-1ubuntu0.1+esm2",
"1.27.1-1ubuntu0.1+esm3",
"1.27.1-1ubuntu0.1+esm4",
"1.27.1-1ubuntu0.1+esm5"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-5704",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"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": "tar",
"binary_version": "1.28-2.1ubuntu0.2+esm5"
},
{
"binary_name": "tar-scripts",
"binary_version": "1.28-2.1ubuntu0.2+esm5"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "tar",
"purl": "pkg:deb/ubuntu/tar@1.28-2.1ubuntu0.2+esm5?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.28-2.1ubuntu0.2+esm5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.27.1-2",
"1.28-2ubuntu1",
"1.28-2.1",
"1.28-2.1ubuntu0.1",
"1.28-2.1ubuntu0.2",
"1.28-2.1ubuntu0.2+esm1",
"1.28-2.1ubuntu0.2+esm2",
"1.28-2.1ubuntu0.2+esm3",
"1.28-2.1ubuntu0.2+esm4"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-5704",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"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": "tar",
"binary_version": "1.29b-2ubuntu0.4+esm3"
},
{
"binary_name": "tar-scripts",
"binary_version": "1.29b-2ubuntu0.4+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "tar",
"purl": "pkg:deb/ubuntu/tar@1.29b-2ubuntu0.4+esm3?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.29b-2ubuntu0.4+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.29b-2",
"1.29b-2ubuntu0.1",
"1.29b-2ubuntu0.2",
"1.29b-2ubuntu0.3",
"1.29b-2ubuntu0.4",
"1.29b-2ubuntu0.4+esm1",
"1.29b-2ubuntu0.4+esm2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-5704",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "tar",
"binary_version": "1.30+dfsg-7ubuntu0.20.04.4+esm2"
},
{
"binary_name": "tar-scripts",
"binary_version": "1.30+dfsg-7ubuntu0.20.04.4+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "tar",
"purl": "pkg:deb/ubuntu/tar@1.30+dfsg-7ubuntu0.20.04.4+esm2?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.30+dfsg-7ubuntu0.20.04.4+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.30+dfsg-6",
"1.30+dfsg-7",
"1.30+dfsg-7ubuntu0.20.04.1",
"1.30+dfsg-7ubuntu0.20.04.2",
"1.30+dfsg-7ubuntu0.20.04.3",
"1.30+dfsg-7ubuntu0.20.04.4",
"1.30+dfsg-7ubuntu0.20.04.4+esm1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-5704",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "tar",
"binary_version": "1.34+dfsg-1ubuntu0.1.22.04.5"
},
{
"binary_name": "tar-scripts",
"binary_version": "1.34+dfsg-1ubuntu0.1.22.04.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "tar",
"purl": "pkg:deb/ubuntu/tar@1.34+dfsg-1ubuntu0.1.22.04.5?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.34+dfsg-1ubuntu0.1.22.04.5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.34+dfsg-1build1",
"1.34+dfsg-1build2",
"1.34+dfsg-1build3",
"1.34+dfsg-1ubuntu0.1.22.04.1",
"1.34+dfsg-1ubuntu0.1.22.04.2",
"1.34+dfsg-1ubuntu0.1.22.04.3",
"1.34+dfsg-1ubuntu0.1.22.04.4"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-5704",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "tar",
"binary_version": "1.35+dfsg-3ubuntu0.3"
},
{
"binary_name": "tar-scripts",
"binary_version": "1.35+dfsg-3ubuntu0.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "tar",
"purl": "pkg:deb/ubuntu/tar@1.35+dfsg-3ubuntu0.3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.35+dfsg-3ubuntu0.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.34+dfsg-1.2ubuntu1",
"1.34+dfsg-1.2ubuntu2",
"1.34+dfsg-1.3ubuntu1",
"1.34+dfsg-1.4",
"1.35+dfsg-2~build1",
"1.35+dfsg-2",
"1.35+dfsg-3",
"1.35+dfsg-3build1",
"1.35+dfsg-3ubuntu0.1",
"1.35+dfsg-3ubuntu0.2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-5704",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "tar",
"binary_version": "1.35+dfsg-4ubuntu0.3"
},
{
"binary_name": "tar-scripts",
"binary_version": "1.35+dfsg-4ubuntu0.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "tar",
"purl": "pkg:deb/ubuntu/tar@1.35+dfsg-4ubuntu0.3?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.35+dfsg-4ubuntu0.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.35+dfsg-3.1build1",
"1.35+dfsg-3.1build2",
"1.35+dfsg-4",
"1.35+dfsg-4ubuntu0.1",
"1.35+dfsg-4ubuntu0.2"
]
}
],
"aliases": [],
"details": "USN-8477-1 fixed a vulnerability in tar. The update introduced a regression\nthat could cause tar to fail to extract certain valid files.\nThis update fixes the problem.\n\nOriginal advisory details:\n\n It was discovered that tar incorrectly handled certain crafted archive files.\n An attacker could possibly use this to inject hidden files with\n attacker-controlled content, bypassing pre-extraction inspection mechanisms.",
"id": "USN-8477-2",
"modified": "2026-07-16T20:05:33Z",
"published": "2026-07-16T20:05:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8477-2"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-5704"
},
{
"type": "REPORT",
"url": "https://launchpad.net/bugs/2160650"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "tar regression",
"upstream": [
"UBUNTU-CVE-2026-5704"
]
}
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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
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