usn-8362-1
Vulnerability from osv_ubuntu
Published
2026-06-02 09:17
Modified
2026-06-02 09:17
Summary
xz-utils vulnerability
Details
It was discovered that XZ Utils did not properly manage memory when attempting to append data to a decoded index that contained no records. An attacker could possibly use this issue to cause XZ Utils to crash, resulting in a denial of service, or execute arbitrary code.
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34743",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"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": "liblzma5",
"binary_version": "5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2"
},
{
"binary_name": "xz-utils",
"binary_version": "5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2"
},
{
"binary_name": "xzdec",
"binary_version": "5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "xz-utils",
"purl": "pkg:deb/ubuntu/xz-utils@5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.1.1alpha+20120614-2ubuntu1",
"5.1.1alpha+20120614-2ubuntu2",
"5.1.1alpha+20120614-2ubuntu2.14.04.1+esm1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34743",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"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": "liblzma5",
"binary_version": "5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2"
},
{
"binary_name": "xz-utils",
"binary_version": "5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2"
},
{
"binary_name": "xzdec",
"binary_version": "5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "xz-utils",
"purl": "pkg:deb/ubuntu/xz-utils@5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.1.1alpha+20120614-2ubuntu2",
"5.1.1alpha+20120614-2ubuntu2.16.04.1+esm1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34743",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "liblzma5",
"binary_version": "5.2.2-1.3ubuntu0.1+esm1"
},
{
"binary_name": "xz-utils",
"binary_version": "5.2.2-1.3ubuntu0.1+esm1"
},
{
"binary_name": "xzdec",
"binary_version": "5.2.2-1.3ubuntu0.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "xz-utils",
"purl": "pkg:deb/ubuntu/xz-utils@5.2.2-1.3ubuntu0.1+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.2.2-1.3ubuntu0.1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.2.2-1.3",
"5.2.2-1.3ubuntu0.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34743",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "liblzma5",
"binary_version": "5.2.4-1ubuntu1.1+esm1"
},
{
"binary_name": "xz-utils",
"binary_version": "5.2.4-1ubuntu1.1+esm1"
},
{
"binary_name": "xzdec",
"binary_version": "5.2.4-1ubuntu1.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "xz-utils",
"purl": "pkg:deb/ubuntu/xz-utils@5.2.4-1ubuntu1.1+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.2.4-1ubuntu1.1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.2.4-1",
"5.2.4-1ubuntu1",
"5.2.4-1ubuntu1.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34743",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "liblzma5",
"binary_version": "5.2.5-2ubuntu1.1"
},
{
"binary_name": "xz-utils",
"binary_version": "5.2.5-2ubuntu1.1"
},
{
"binary_name": "xzdec",
"binary_version": "5.2.5-2ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "xz-utils",
"purl": "pkg:deb/ubuntu/xz-utils@5.2.5-2ubuntu1.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.2.5-2ubuntu1.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.2.5-2",
"5.2.5-2build1",
"5.2.5-2build2",
"5.2.5-2ubuntu1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34743",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "liblzma5",
"binary_version": "5.6.1+really5.4.5-1ubuntu0.3"
},
{
"binary_name": "xz-utils",
"binary_version": "5.6.1+really5.4.5-1ubuntu0.3"
},
{
"binary_name": "xzdec",
"binary_version": "5.6.1+really5.4.5-1ubuntu0.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "xz-utils",
"purl": "pkg:deb/ubuntu/xz-utils@5.6.1+really5.4.5-1ubuntu0.3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.6.1+really5.4.5-1ubuntu0.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.4.1-0.2",
"5.4.4-0.1",
"5.4.5-0.1",
"5.4.5-0.3",
"5.6.0-0.2",
"5.6.1+really5.4.5-1",
"5.6.1+really5.4.5-1build0.1",
"5.6.1+really5.4.5-1ubuntu0.2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34743",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:25.10"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "liblzma5",
"binary_version": "5.8.1-1ubuntu0.1"
},
{
"binary_name": "xz-utils",
"binary_version": "5.8.1-1ubuntu0.1"
},
{
"binary_name": "xzdec",
"binary_version": "5.8.1-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "xz-utils",
"purl": "pkg:deb/ubuntu/xz-utils@5.8.1-1ubuntu0.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.8.1-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.6.4-1ubuntu1",
"5.8.1-1",
"5.8.1-1build1",
"5.8.1-1build2"
]
}
],
"aliases": [],
"details": "It was discovered that XZ Utils did not properly manage memory when\nattempting to append data to a decoded index that contained no records.\nAn attacker could possibly use this issue to cause XZ Utils to crash,\nresulting in a denial of service, or execute arbitrary code.",
"id": "USN-8362-1",
"modified": "2026-06-02T09:17:00Z",
"published": "2026-06-02T09:17:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8362-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-34743"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "xz-utils vulnerability",
"upstream": [
"UBUNTU-CVE-2026-34743"
]
}
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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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