usn-8386-1
Vulnerability from osv_ubuntu
Published
2026-06-04 17:00
Modified
2026-06-04 17:00
Summary
nano vulnerabilities
Details
Michał Majchrowicz and Marcin Wyczechowski discovered that Nano created the ~/.local directory with incorrect permissions. In environments with permissive umask settings, a local attacker could possibly use this issue to inject a malicious launcher file, resulting in information disclosure or other unintended actions. (CVE-2026-6842)
Michał Majchrowicz and Marcin Wyczechowski discovered that Nano incorrectly handled directory names when updating the status line. A local attacker could possibly use this issue to cause Nano to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-6843)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-6842",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/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": "nano",
"binary_version": "2.9.3-2ubuntu0.1~esm2"
},
{
"binary_name": "nano-tiny",
"binary_version": "2.9.3-2ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@2.9.3-2ubuntu0.1~esm2?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.3-2ubuntu0.1~esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.8.6-3",
"2.8.7-1",
"2.9.0-1",
"2.9.1-1",
"2.9.2-1",
"2.9.3-1",
"2.9.3-2",
"2.9.3-2ubuntu0.1~esm1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-6842",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/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": "nano",
"binary_version": "4.8-1ubuntu1.1+esm1"
},
{
"binary_name": "nano-tiny",
"binary_version": "4.8-1ubuntu1.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@4.8-1ubuntu1.1+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.8-1ubuntu1.1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.3-1",
"4.5-1",
"4.7-1",
"4.7-2",
"4.8-1",
"4.8-1ubuntu1",
"4.8-1ubuntu1.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-6842",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-6843",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "nano",
"binary_version": "6.2-1ubuntu0.2"
},
{
"binary_name": "nano-tiny",
"binary_version": "6.2-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@6.2-1ubuntu0.2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.2-1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.6.1-1build1",
"5.9-1",
"6.0-1",
"6.1-1",
"6.2-1",
"6.2-1ubuntu0.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-6842",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-6843",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "nano",
"binary_version": "7.2-2ubuntu0.2"
},
{
"binary_name": "nano-tiny",
"binary_version": "7.2-2ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@7.2-2ubuntu0.2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "7.2-2ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.2-1",
"7.2-2",
"7.2-2build1",
"7.2-2ubuntu0.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-6842",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-6843",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:25.10"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "nano",
"binary_version": "8.4-1ubuntu0.1"
},
{
"binary_name": "nano-tiny",
"binary_version": "8.4-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@8.4-1ubuntu0.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "8.4-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.3-1",
"8.4-1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-6842",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-6843",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "nano",
"binary_version": "8.7.1-1ubuntu0.1"
},
{
"binary_name": "nano-tiny",
"binary_version": "8.7.1-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@8.7.1-1ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "8.7.1-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.4-1",
"8.6-1",
"8.7-1",
"8.7.1-1"
]
}
],
"aliases": [],
"details": "Micha\u0142 Majchrowicz and Marcin Wyczechowski discovered that Nano created\nthe ~/.local directory with incorrect permissions. In environments with\npermissive umask settings, a local attacker could possibly use this\nissue to inject a malicious launcher file, resulting in information\ndisclosure or other unintended actions. (CVE-2026-6842)\n\nMicha\u0142 Majchrowicz and Marcin Wyczechowski discovered that Nano\nincorrectly handled directory names when updating the status line. A\nlocal attacker could possibly use this issue to cause Nano to crash,\nresulting in a denial of service. This issue only affected Ubuntu 22.04\nLTS, Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS.\n(CVE-2026-6843)",
"id": "USN-8386-1",
"modified": "2026-06-04T17:00:06Z",
"published": "2026-06-04T17:00:06Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8386-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-6842"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-6843"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "nano vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-6842",
"UBUNTU-CVE-2026-6843"
]
}
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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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