USN-8897-1 (UBUNTU-CVE-2026-41066)
Vulnerability from osv_ubuntu – Published: 2026-10-07 16:13 – Updated: 2026-10-07 16:13 – Source website
VLAI
Summary
lxml vulnerabilities
Details
Guillem Lefait discovered that lxml incorrectly handled certain URL attributes. A remote attacker could possibly use this issue to bypass URL sanitization, leading to a cross-site scripting attack. (CVE-2026-49825)
Qiu Sihao discovered that lxml incorrectly handled untrusted XML input. A remote attacker could possibly use this issue to read local files and expose sensitive information. This issue was only addressed in Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-41066)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-41066",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-49825",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/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": "python-lxml",
"binary_version": "3.3.3-1ubuntu0.2+esm6"
},
{
"binary_name": "python3-lxml",
"binary_version": "3.3.3-1ubuntu0.2+esm6"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "lxml",
"purl": "pkg:deb/ubuntu/lxml@3.3.3-1ubuntu0.2+esm6?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.3.3-1ubuntu0.2+esm6"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.2.0-1",
"3.3.0~beta2-1",
"3.3.0~beta4-1",
"3.3.1-1",
"3.3.2-1",
"3.3.2-1build1",
"3.3.3-1",
"3.3.3-1ubuntu0.1",
"3.3.3-1ubuntu0.2",
"3.3.3-1ubuntu0.2+esm1",
"3.3.3-1ubuntu0.2+esm2",
"3.3.3-1ubuntu0.2+esm3",
"3.3.3-1ubuntu0.2+esm5"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-41066",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-49825",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/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": "python-lxml",
"binary_version": "3.5.0-1ubuntu0.4+esm3"
},
{
"binary_name": "python3-lxml",
"binary_version": "3.5.0-1ubuntu0.4+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "lxml",
"purl": "pkg:deb/ubuntu/lxml@3.5.0-1ubuntu0.4+esm3?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.0-1ubuntu0.4+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.4.4-1",
"3.5.0-1",
"3.5.0-1build1",
"3.5.0-1ubuntu0.1",
"3.5.0-1ubuntu0.2",
"3.5.0-1ubuntu0.3",
"3.5.0-1ubuntu0.4",
"3.5.0-1ubuntu0.4+esm2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-41066",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-49825",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/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": "python-lxml",
"binary_version": "4.2.1-1ubuntu0.6+esm1"
},
{
"binary_name": "python3-lxml",
"binary_version": "4.2.1-1ubuntu0.6+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "lxml",
"purl": "pkg:deb/ubuntu/lxml@4.2.1-1ubuntu0.6+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.2.1-1ubuntu0.6+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.0.0-1",
"4.1.0-1",
"4.2.0-1",
"4.2.1-1",
"4.2.1-1ubuntu0.1",
"4.2.1-1ubuntu0.2",
"4.2.1-1ubuntu0.3",
"4.2.1-1ubuntu0.4",
"4.2.1-1ubuntu0.6"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-41066",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-49825",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/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": "python-lxml",
"binary_version": "4.5.0-1ubuntu0.5+esm1"
},
{
"binary_name": "python3-lxml",
"binary_version": "4.5.0-1ubuntu0.5+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "lxml",
"purl": "pkg:deb/ubuntu/lxml@4.5.0-1ubuntu0.5+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.5.0-1ubuntu0.5+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.4.1-1",
"4.4.1-1build1",
"4.4.2-1",
"4.5.0-1",
"4.5.0-1ubuntu0.1",
"4.5.0-1ubuntu0.2",
"4.5.0-1ubuntu0.3",
"4.5.0-1ubuntu0.5"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-41066",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-49825",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python3-lxml",
"binary_version": "4.8.0-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "lxml",
"purl": "pkg:deb/ubuntu/lxml@4.8.0-1ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.8.0-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.6.3+dfsg-0.1",
"4.6.4-1",
"4.6.4-1ubuntu1",
"4.7.1-1",
"4.8.0-1",
"4.8.0-1build1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-41066",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-49825",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python3-lxml",
"binary_version": "5.2.1-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "lxml",
"purl": "pkg:deb/ubuntu/lxml@5.2.1-1ubuntu0.2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.2.1-1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.9.3-1",
"4.9.3-1build1",
"4.9.4-1",
"5.1.0-1",
"5.1.0-1build1",
"5.1.0-1build2",
"5.2.1-1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-41066",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-49825",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python3-lxml",
"binary_version": "6.0.2-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "lxml",
"purl": "pkg:deb/ubuntu/lxml@6.0.2-1ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.0.2-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"6.0.1-1",
"6.0.1-1build1",
"6.0.2-1",
"6.0.2-1build1"
]
}
],
"aliases": [],
"details": "Guillem Lefait discovered that lxml incorrectly handled certain URL\nattributes. A remote attacker could possibly use this issue to bypass\nURL sanitization, leading to a cross-site scripting attack.\n(CVE-2026-49825)\n\nQiu Sihao discovered that lxml incorrectly handled untrusted XML input.\nA remote attacker could possibly use this issue to read local files and\nexpose sensitive information. This issue was only addressed in Ubuntu 24.04\nLTS and Ubuntu 26.04 LTS. (CVE-2026-41066)",
"id": "USN-8897-1",
"modified": "2026-10-07T16:13:52Z",
"published": "2026-10-07T16:13:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8897-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-41066"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-49825"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "lxml vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-41066",
"UBUNTU-CVE-2026-49825"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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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.
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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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