USN-8779-2
Vulnerability from osv_ubuntu – Published: 2026-09-17 22:20 – Updated: 2026-09-17 22:20 – Source website
VLAI
Summary
bubblewrap regression
Details
USN-8779-1 fixed vulnerabilities in Bubblewrap. Unfortunately, the fix for CVE-2026-87766 introduced a regression in symlink resolution, preventing certain Flatpak applications from launching. This update reverts that fix until a complete fix is available.
We apologize for the inconvenience.
Original advisory details:
It was discovered that Bubblewrap incorrectly handled certain temporary directories. A local attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-12439)
It was discovered that Bubblewrap incorrectly handled certain symlinks during sandbox setup. A local attacker could possibly use this issue to create files outside of the sandbox. (CVE-2026-87766)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "bubblewrap",
"binary_version": "0.2.1-1ubuntu0.1+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "bubblewrap",
"purl": "pkg:deb/ubuntu/bubblewrap@0.2.1-1ubuntu0.1+esm3?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.2.1-1ubuntu0.1+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.2.0-1",
"0.2.0-2",
"0.2.0-4",
"0.2.1-1",
"0.2.1-1ubuntu0.1",
"0.2.1-1ubuntu0.1+esm2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "bubblewrap",
"binary_version": "0.4.0-1ubuntu4.1+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "bubblewrap",
"purl": "pkg:deb/ubuntu/bubblewrap@0.4.0-1ubuntu4.1+esm3?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.0-1ubuntu4.1+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.3.3-2",
"0.4.0-1",
"0.4.0-1ubuntu1",
"0.4.0-1ubuntu2",
"0.4.0-1ubuntu3",
"0.4.0-1ubuntu4",
"0.4.0-1ubuntu4.1",
"0.4.0-1ubuntu4.1+esm2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "bubblewrap",
"binary_version": "0.6.1-1ubuntu0.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "bubblewrap",
"purl": "pkg:deb/ubuntu/bubblewrap@0.6.1-1ubuntu0.3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.6.1-1ubuntu0.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.4.1-3build1",
"0.5.0-1",
"0.6.0-1",
"0.6.1-1",
"0.6.1-1ubuntu0.1",
"0.6.1-1ubuntu0.2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "bubblewrap",
"binary_version": "0.9.0-1ubuntu0.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "bubblewrap",
"purl": "pkg:deb/ubuntu/bubblewrap@0.9.0-1ubuntu0.3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.9.0-1ubuntu0.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.8.0-2",
"0.9.0-1build1",
"0.9.0-1ubuntu0.1",
"0.9.0-1ubuntu0.2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "bubblewrap",
"binary_version": "0.11.1-1ubuntu0.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "bubblewrap",
"purl": "pkg:deb/ubuntu/bubblewrap@0.11.1-1ubuntu0.3?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.11.1-1ubuntu0.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.11.0-2",
"0.11.0-2build1",
"0.11.1-1",
"0.11.1-1ubuntu0.1",
"0.11.1-1ubuntu0.2"
]
}
],
"aliases": [],
"details": "USN-8779-1 fixed vulnerabilities in Bubblewrap. Unfortunately, the fix for\nCVE-2026-87766 introduced a regression in symlink resolution, preventing\ncertain Flatpak applications from launching. This update reverts that fix\nuntil a complete fix is available.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that Bubblewrap incorrectly handled certain temporary\n directories. A local attacker could possibly use this issue to cause a\n denial of service or execute arbitrary code. This issue only affected\n Ubuntu 18.04 LTS. (CVE-2019-12439)\n\n It was discovered that Bubblewrap incorrectly handled certain symlinks\n during sandbox setup. A local attacker could possibly use this issue to\n create files outside of the sandbox. (CVE-2026-87766)",
"id": "USN-8779-2",
"modified": "2026-09-17T22:20:14Z",
"published": "2026-09-17T22:20:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8779-2"
},
{
"type": "REPORT",
"url": "https://bugs.launchpad.net/ubuntu/+source/bubblewrap/+bug/2167621"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "bubblewrap regression",
"upstream": []
}
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Sightings
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|---|
Nomenclature
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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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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