USN-8741-1 (UBUNTU-CVE-2026-34078)
Vulnerability from osv_ubuntu – Published: 2026-09-10 08:44 – Updated: 2026-09-10 08:44 – Source website
VLAI
Summary
flatpak vulnerabilities
Details
It was discovered that Flatpak did not properly validate paths in sandbox-expose options. A malicious or compromised Flatpak app could use app-controlled symlinks to access arbitrary host files and gain code execution in the host context. This issue was addressed in Ubuntu Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-34078)
It was discovered that Flatpak did not properly validate paths when
removing outdated ld.so cache files. A malicious or compromised Flatpak
app could use this issue to delete arbitrary files on the host.
(CVE-2026-34079)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34079",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "flatpak",
"binary_version": "1.0.9-0ubuntu0.4+esm1"
},
{
"binary_name": "flatpak-tests",
"binary_version": "1.0.9-0ubuntu0.4+esm1"
},
{
"binary_name": "gir1.2-flatpak-1.0",
"binary_version": "1.0.9-0ubuntu0.4+esm1"
},
{
"binary_name": "libflatpak0",
"binary_version": "1.0.9-0ubuntu0.4+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "flatpak",
"purl": "pkg:deb/ubuntu/flatpak@1.0.9-0ubuntu0.4+esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.9-0ubuntu0.4+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.8.7-5",
"0.10.0-1",
"0.10.0-2",
"0.10.1-1",
"0.10.2-1",
"0.10.2.1-1",
"0.10.2.1-2",
"0.10.3-1",
"0.11.1-0ubuntu1",
"0.11.3-2",
"0.11.3-3",
"0.11.7-0ubuntu0.1",
"1.0.1-0ubuntu0.1",
"1.0.6-0ubuntu0.1",
"1.0.7-0ubuntu0.18.04.1",
"1.0.8-0ubuntu0.18.04.1",
"1.0.9-0ubuntu0.1",
"1.0.9-0ubuntu0.2",
"1.0.9-0ubuntu0.3",
"1.0.9-0ubuntu0.4"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34078",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-34079",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "flatpak",
"binary_version": "1.6.5-0ubuntu0.5+esm1"
},
{
"binary_name": "flatpak-tests",
"binary_version": "1.6.5-0ubuntu0.5+esm1"
},
{
"binary_name": "gir1.2-flatpak-1.0",
"binary_version": "1.6.5-0ubuntu0.5+esm1"
},
{
"binary_name": "libflatpak0",
"binary_version": "1.6.5-0ubuntu0.5+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "flatpak",
"purl": "pkg:deb/ubuntu/flatpak@1.6.5-0ubuntu0.5+esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.5-0ubuntu0.5+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.3-1",
"1.6.0-1",
"1.6.1-1",
"1.6.2-1",
"1.6.3-1",
"1.6.5-0ubuntu0.1",
"1.6.5-0ubuntu0.2",
"1.6.5-0ubuntu0.3",
"1.6.5-0ubuntu0.4",
"1.6.5-0ubuntu0.5"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34078",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-34079",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "flatpak",
"binary_version": "1.12.7-1ubuntu0.1+esm1"
},
{
"binary_name": "flatpak-tests",
"binary_version": "1.12.7-1ubuntu0.1+esm1"
},
{
"binary_name": "gir1.2-flatpak-1.0",
"binary_version": "1.12.7-1ubuntu0.1+esm1"
},
{
"binary_name": "libflatpak0",
"binary_version": "1.12.7-1ubuntu0.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "flatpak",
"purl": "pkg:deb/ubuntu/flatpak@1.12.7-1ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.12.7-1ubuntu0.1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.10.2-3",
"1.12.2-1",
"1.12.2-2",
"1.12.3-1",
"1.12.4-1",
"1.12.5-1",
"1.12.6-1",
"1.12.7-1",
"1.12.7-1ubuntu0.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-34078",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-34079",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "flatpak",
"binary_version": "1.14.6-1ubuntu0.1+esm1"
},
{
"binary_name": "flatpak-tests",
"binary_version": "1.14.6-1ubuntu0.1+esm1"
},
{
"binary_name": "gir1.2-flatpak-1.0",
"binary_version": "1.14.6-1ubuntu0.1+esm1"
},
{
"binary_name": "libflatpak0",
"binary_version": "1.14.6-1ubuntu0.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "flatpak",
"purl": "pkg:deb/ubuntu/flatpak@1.14.6-1ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.14.6-1ubuntu0.1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.14.4-2",
"1.14.5-1",
"1.14.5-1build1",
"1.14.5-1build4",
"1.14.5-1build5",
"1.14.5-1build6",
"1.14.6-1",
"1.14.6-1ubuntu0.1"
]
}
],
"aliases": [],
"details": "It was discovered that Flatpak did not properly validate paths in\nsandbox-expose options. A malicious or compromised Flatpak app could\nuse app-controlled symlinks to access arbitrary host files and gain\ncode execution in the host context. This issue was addressed in Ubuntu\nUbuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-34078) \n\nIt was discovered that Flatpak did not properly validate paths when \nremoving outdated ld.so cache files. A malicious or compromised Flatpak\napp could use this issue to delete arbitrary files on the host. \n(CVE-2026-34079)",
"id": "USN-8741-1",
"modified": "2026-09-10T08:44:18Z",
"published": "2026-09-10T08:44:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8741-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-34078"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-34079"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "flatpak vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-34078",
"UBUNTU-CVE-2026-34079"
]
}
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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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