USN-8996-1 (UBUNTU-CVE-2026-109518)
Vulnerability from osv_ubuntu – Published: 2026-11-04 13:37 – Updated: 2026-11-04 13:37 – Source website
VLAI
Summary
apt vulnerability
Details
Max Justicz discovered that APT incorrectly handled hard links when encountering redirects and retrying package downloads. A remote on-path attacker could possibly use this issue to trick APT into installing an unverified package and achieve remote code execution with root privileges.
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-109518",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "high",
"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": "apt",
"binary_version": "1.0.1ubuntu2.24+esm4"
},
{
"binary_name": "apt-transport-https",
"binary_version": "1.0.1ubuntu2.24+esm4"
},
{
"binary_name": "apt-utils",
"binary_version": "1.0.1ubuntu2.24+esm4"
},
{
"binary_name": "libapt-inst1.5",
"binary_version": "1.0.1ubuntu2.24+esm4"
},
{
"binary_name": "libapt-pkg4.12",
"binary_version": "1.0.1ubuntu2.24+esm4"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "apt",
"purl": "pkg:deb/ubuntu/apt@1.0.1ubuntu2.24+esm4?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.1ubuntu2.24+esm4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.9.1~ubuntu3",
"0.9.9.1~ubuntu4",
"0.9.9.1~ubuntu5",
"0.9.13~exp1ubuntu1",
"0.9.13~exp1ubuntu2",
"0.9.13~exp1ubuntu3",
"0.9.13.1~ubuntu1",
"0.9.14.1ubuntu1",
"0.9.14.1ubuntu2",
"0.9.15.1ubuntu1",
"0.9.15.4ubuntu1",
"0.9.15.4ubuntu2",
"0.9.15.4ubuntu3",
"0.9.15.4ubuntu4",
"0.9.15.4ubuntu5",
"1.0.1ubuntu2",
"1.0.1ubuntu2.1",
"1.0.1ubuntu2.3",
"1.0.1ubuntu2.4.1",
"1.0.1ubuntu2.5",
"1.0.1ubuntu2.6",
"1.0.1ubuntu2.7",
"1.0.1ubuntu2.8",
"1.0.1ubuntu2.9",
"1.0.1ubuntu2.10",
"1.0.1ubuntu2.11",
"1.0.1ubuntu2.12",
"1.0.1ubuntu2.13",
"1.0.1ubuntu2.14",
"1.0.1ubuntu2.15",
"1.0.1ubuntu2.17",
"1.0.1ubuntu2.18",
"1.0.1ubuntu2.19",
"1.0.1ubuntu2.20",
"1.0.1ubuntu2.22",
"1.0.1ubuntu2.23",
"1.0.1ubuntu2.24",
"1.0.1ubuntu2.24+esm1",
"1.0.1ubuntu2.24+esm3"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-109518",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "high",
"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": "apt",
"binary_version": "1.2.36+esm1"
},
{
"binary_name": "apt-transport-https",
"binary_version": "1.2.36+esm1"
},
{
"binary_name": "apt-utils",
"binary_version": "1.2.36+esm1"
},
{
"binary_name": "libapt-inst2.0",
"binary_version": "1.2.36+esm1"
},
{
"binary_name": "libapt-pkg5.0",
"binary_version": "1.2.36+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "apt",
"purl": "pkg:deb/ubuntu/apt@1.2.36+esm1?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.36+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.10.2ubuntu1",
"1.1.4",
"1.1.5",
"1.1.10",
"1.2.3",
"1.2.4",
"1.2.6",
"1.2.7",
"1.2.8",
"1.2.9",
"1.2.10",
"1.2.10ubuntu1",
"1.2.12~ubuntu16.04.1",
"1.2.15",
"1.2.15ubuntu0.2",
"1.2.18",
"1.2.19",
"1.2.20",
"1.2.24",
"1.2.25",
"1.2.26",
"1.2.27",
"1.2.29",
"1.2.29ubuntu0.1",
"1.2.31",
"1.2.32",
"1.2.32ubuntu0.1",
"1.2.32ubuntu0.2",
"1.2.35"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-109518",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "high",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "apt",
"binary_version": "1.6.19+esm1"
},
{
"binary_name": "apt-transport-https",
"binary_version": "1.6.19+esm1"
},
{
"binary_name": "apt-utils",
"binary_version": "1.6.19+esm1"
},
{
"binary_name": "libapt-inst2.0",
"binary_version": "1.6.19+esm1"
},
{
"binary_name": "libapt-pkg5.0",
"binary_version": "1.6.19+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "apt",
"purl": "pkg:deb/ubuntu/apt@1.6.19+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.19+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.5",
"1.5.1",
"1.6~alpha5",
"1.6~alpha7ubuntu1",
"1.6~alpha7ubuntu2",
"1.6~beta1",
"1.6~rc1",
"1.6",
"1.6.1",
"1.6.2",
"1.6.3",
"1.6.3ubuntu0.1",
"1.6.6",
"1.6.6ubuntu0.1",
"1.6.8",
"1.6.10",
"1.6.11",
"1.6.12",
"1.6.12ubuntu0.1",
"1.6.12ubuntu0.2",
"1.6.13",
"1.6.14",
"1.6.17",
"1.6.18~esm1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-109518",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "high",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "apt",
"binary_version": "2.0.12+esm1"
},
{
"binary_name": "apt-transport-https",
"binary_version": "2.0.12+esm1"
},
{
"binary_name": "apt-utils",
"binary_version": "2.0.12+esm1"
},
{
"binary_name": "libapt-pkg6.0",
"binary_version": "2.0.12+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "apt",
"purl": "pkg:deb/ubuntu/apt@2.0.12+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.12+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.9.4",
"1.9.5",
"1.9.7",
"1.9.8",
"1.9.9",
"1.9.10",
"2.0.0",
"2.0.1",
"2.0.1ubuntu1",
"2.0.2",
"2.0.2ubuntu0.1",
"2.0.2ubuntu0.2",
"2.0.4",
"2.0.5",
"2.0.6",
"2.0.8",
"2.0.9",
"2.0.10",
"2.0.11"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-109518",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "high",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "apt",
"binary_version": "2.4.15ubuntu0.1"
},
{
"binary_name": "apt-transport-https",
"binary_version": "2.4.15ubuntu0.1"
},
{
"binary_name": "apt-utils",
"binary_version": "2.4.15ubuntu0.1"
},
{
"binary_name": "libapt-pkg6.0",
"binary_version": "2.4.15ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "apt",
"purl": "pkg:deb/ubuntu/apt@2.4.15ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.15ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.3.9",
"2.3.11",
"2.3.12",
"2.3.13",
"2.3.14",
"2.3.15",
"2.3.15build1",
"2.4.1",
"2.4.3",
"2.4.5",
"2.4.6",
"2.4.7",
"2.4.8",
"2.4.9",
"2.4.10",
"2.4.11",
"2.4.12",
"2.4.13",
"2.4.14"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-109518",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "high",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "apt",
"binary_version": "2.8.4ubuntu0.1"
},
{
"binary_name": "apt-transport-https",
"binary_version": "2.8.4ubuntu0.1"
},
{
"binary_name": "apt-utils",
"binary_version": "2.8.4ubuntu0.1"
},
{
"binary_name": "libapt-pkg6.0t64",
"binary_version": "2.8.4ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "apt",
"purl": "pkg:deb/ubuntu/apt@2.8.4ubuntu0.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.8.4ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.3",
"2.7.6",
"2.7.10",
"2.7.11",
"2.7.12",
"2.7.14",
"2.7.14build2",
"2.8.3"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-109518",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "high",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.10"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "apt",
"binary_version": "3.3.3ubuntu0.1"
},
{
"binary_name": "apt-transport-https",
"binary_version": "3.3.3ubuntu0.1"
},
{
"binary_name": "apt-utils",
"binary_version": "3.3.3ubuntu0.1"
},
{
"binary_name": "libapt-pkg7.0",
"binary_version": "3.3.3ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.10",
"name": "apt",
"purl": "pkg:deb/ubuntu/apt@3.3.3ubuntu0.1?arch=source\u0026distro=stonking"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.3.3ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.2.0",
"3.3.2",
"3.3.3"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-109518",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "high",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "apt",
"binary_version": "3.2.1ubuntu0.1"
},
{
"binary_name": "apt-transport-https",
"binary_version": "3.2.1ubuntu0.1"
},
{
"binary_name": "apt-utils",
"binary_version": "3.2.1ubuntu0.1"
},
{
"binary_name": "libapt-pkg7.0",
"binary_version": "3.2.1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "apt",
"purl": "pkg:deb/ubuntu/apt@3.2.1ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.2.1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.6ubuntu2",
"3.1.8ubuntu1",
"3.1.11",
"3.1.12",
"3.1.13",
"3.1.14",
"3.1.15",
"3.1.16",
"3.2.0"
]
}
],
"aliases": [],
"details": "Max Justicz discovered that APT incorrectly handled hard links when\nencountering redirects and retrying package downloads. A remote on-path\nattacker could possibly use this issue to trick APT into installing an\nunverified package and achieve remote code execution with root privileges.",
"id": "USN-8996-1",
"modified": "2026-11-04T13:37:00Z",
"published": "2026-11-04T13:37:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8996-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-109518"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "apt vulnerability",
"upstream": [
"UBUNTU-CVE-2026-109518"
]
}
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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.
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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.