CVE catalog

CVE-2026-90616

In Flatpak before 1.18.1, a malicious sandboxed app…

In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, which can be escalated to arbitrary code execution on the host, a different vulnerability than CVE-2026-76925. Flatpak creates a few app data directories (e.g., /var/cache, /var/data, /var/config, and /var/tmp) in every sandbox on every app launch where, in some cases, components of the path are attacker-controlled. Missing symlink protection can redirect the directories. Some of these directories are bind-mounted by Flatpak by passing the path (e.g., /home/user/.var/app/APP_ID/cache/tmp), which contains attacker-controlled directories (tmp) to bwrap --bind SRC DST. bwrap passes the path on to the kernel, which then follows symlinks. A malicious symlink can point to arbitrary locations on the host and it will become mounted inside the sandbox.

Severity: High · CVSS 8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published: Sep 12, 2026, 8:00:58 PM UTC
Updated: Sep 12, 2026, 8:16:30 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.18% · Oct 27, 2026

Projects and upstream resources

[flatpak][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "flatpak",
      "status": "fixed",
      "release": "sid",
      "version": "1.18.4-1"
    },
    {
      "name": "flatpak",
      "status": "fixed",
      "release": "forky",
      "version": "1.18.4-1"
    },
    {
      "name": "flatpak",
      "status": "vulnerable",
      "release": "trixie",
      "version": "1.16.6-1~deb13u2"
    },
    {
      "name": "flatpak",
      "status": "fixed",
      "release": "trixie-security",
      "version": "1.16.6-1~deb13u3"
    },
    {
      "name": "flatpak",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1.14.10-1~deb12u2"
    },
    {
      "name": "flatpak",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "1.14.10-1~deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1144130,
      "name": "flatpak",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1.18.1-1"
    },
    {
      "bug": 1144130,
      "name": "flatpak",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1.18.1-1"
    },
    {
      "bug": 1144130,
      "name": "flatpak",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "1.16.6-1~deb13u3"
    },
    {
      "bug": 1144130,
      "name": "flatpak",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "flatpak",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.2-3.15.1"
            }
          ]
        }
      ],
      "release": "linux enterprise server 12 sp5-ltss",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "1.4.2-3.15.1",
      "provider_record_id": "SUSE-SU-2026:4610-1"
    },
    {
      "name": "flatpak",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.2-3.15.1"
            }
          ]
        }
      ],
      "release": "linux enterprise server ltss extended security 12 sp5",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "1.4.2-3.15.1",
      "provider_record_id": "SUSE-SU-2026:4610-1"
    },
    {
      "name": "flatpak",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "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",
        "1.14.6-1ubuntu0.1+esm1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-90616"
    },
    {
      "name": "flatpak",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "1.16.1-2ubuntu1",
        "1.16.1-3ubuntu1",
        "1.16.2-1",
        "1.16.3-1",
        "1.16.3-1build1",
        "1.16.4-1",
        "1.16.4-2",
        "1.16.6-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-90616"
    }
  ]
}

[Debian bug #1144130]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[flatpak]Unknown
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[flatpak-tests]Unknown
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[gir1.2-flatpak-1.0]Unknown
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[libflatpak0]Unknown
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[libflatpak-dev]Unknown
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[libflatpak-doc]Unknown
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · all · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · all · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · all · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · all · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12

[Debian 13 (Trixie)]

[flatpak]Unknown
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
[flatpak-tests]Unknown
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
[gir1.2-flatpak-1.0]Unknown
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
[libflatpak0]Unknown
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
[libflatpak-dev]Unknown
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
[libflatpak-doc]Unknown
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · all · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · all · trixie
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · all · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · all · trixie-security
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · all · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · all · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u3
  nvd · flatpak · debian · 13

Observed: Oct 27, 2026, 6:29:18 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]