Vulnerability-Lookup

CVE-2026-96807 (GCVE-0-2026-96807)

Vulnerability from cvelistv5 – Published: 2026-09-23 16:54 – Updated: 2026-09-26 22:51

Summary

In Flatpak before 1.18.1, a malicious sandboxed app can replace ~/.var/app/$appid/.ld.so with a symlink, causing regenerate_ld_cache to write files at an arbitrary location. The filenames and content are not attacker controlled, making this hard to exploit.

Severity

4 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-26 22:45 UTC

CWE

CWE-61 - UNIX Symbolic Link (Symlink) Following

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2324 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/flatpak/flatpak/security/advis…

Impacted products

1 product

Vendor	Product	Version	CPE status
Flatpak	Flatpak	Affected: 0 , < 1.18.1 (semver) cpe:2.3:a:flatpak:flatpak::::::::

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-96807

Vulnerability from fkie_nvd - Published: 2026-09-23 17:17 - Updated: 2026-09-26 23:16

Severity

4.0 (Medium) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Summary

References

	URL	Tags
	cve@mitre.org	https://github.com/flatpak/flatpak/security/advisories/GHSA-99wv-m8rp-g58x

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "source": "cve@mitre.org",
      "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-99wv-m8rp-g58x"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-61"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Secondary"
    }
  ]
}

SUSE-SU-2026:4610-1

Vulnerability from csaf_suse - Published: 2026-10-09 15:55 - Updated: 2026-10-10 08:42

Summary

Security update for flatpak

Severity

Important

Scope

9 vulnerabilities in this advisory, including CVE-2026-96807.

CVE-2026-96807

5.2 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L

Recommended: 51 products

Open the full advisory

UBUNTU-CVE-2026-96807 (CVE-2026-96807)

Vulnerability from osv_ubuntu – Published: 2026-09-23 17:17 – Updated: 2026-09-30 21:39 – Source website

Details

Severity

4.0 (Medium)


                    
                      CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-96807	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-96807	REPORT
	https://github.com/flatpak/flatpak/security/advis…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "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",
        "1.0.9-0ubuntu0.4+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "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",
        "1.6.5-0ubuntu0.5+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "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",
        "1.12.7-1ubuntu0.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "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",
        "1.14.6-1ubuntu0.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "flatpak",
            "binary_version": "1.16.6-1"
          },
          {
            "binary_name": "flatpak-tests",
            "binary_version": "1.16.6-1"
          },
          {
            "binary_name": "gir1.2-flatpak-1.0",
            "binary_version": "1.16.6-1"
          },
          {
            "binary_name": "libflatpak0",
            "binary_version": "1.16.6-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "flatpak",
        "purl": "pkg:deb/ubuntu/flatpak@1.16.6-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    }
  ],
  "aliases": [],
  "details": "In Flatpak before 1.18.1, a malicious sandboxed app can replace ~/.var/app/$appid/.ld.so with a symlink, causing regenerate_ld_cache to write files at an arbitrary location. The filenames and content are not attacker controlled, making this hard to exploit.",
  "id": "UBUNTU-CVE-2026-96807",
  "modified": "2026-09-30T21:39:34Z",
  "published": "2026-09-23T17:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-96807"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-96807"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-99wv-m8rp-g58x"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-96807"
  ]
}

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.

Vulnerability timeline

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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.

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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.

Action not permitted

CVE-2026-96807 (GCVE-0-2026-96807)

FKIE_CVE-2026-96807

SUSE-SU-2026:4610-1

UBUNTU-CVE-2026-96807 (CVE-2026-96807)

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