cve-2026-96807

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Linux"
          ],
          "product": "Flatpak",
          "programFiles": [
            "common/flatpak-run.c"
          ],
          "programRoutines": [
            {
              "name": "regenerate_ld_cache"
            }
          ],
          "repo": "https://github.com/flatpak/flatpak",
          "vendor": "Flatpak",
          "versions": [
            {
              "lessThan": "1.18.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "1.18.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-61",
              "description": "CWE-61 UNIX Symbolic Link (Symlink) Following",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-23T16:54:16.931Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-99wv-m8rp-g58x"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "<p>The issue has been fixed in version 1.18.1 by commits:</p>\n<ul>\n<li><a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/e13dfeda330625d2fecc3a54672dfd4dc9c83a5c\">e13dfed</a> \"common: Fix return value and typos in flatpak_switch_symlink_and_remove\"</li>\n<li><a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/f6c8fb5fdb3737e2f45068afe12c4bf1d808fd55\">f6c8fb5</a> \"common: Use fd-based operations in flatpak_switch_symlink_and_remove\"</li>\n<li><a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/76c9296b6780ca67f44cf67f0823f086d692a592\">76c9296</a> \"run: Harden regenerate_ld_cache against symlink attacks\"</li>\n</ul>\n<p>For LTS operating system distributions, backports of these changes are available in the <code>flatpak-1.16.x</code>\n branch. Please note that cherry-picked libglnx changes \"chase: Add \ninternal glnx_chaseat_full for a strategic callback\" and \"chase: Add \nglnx_chase_and_mkdirat\" are also required.</p>"
            }
          ],
          "value": "The issue has been fixed in version 1.18.1 by commits:\n\n\n\n  *   e13dfed https://github.com/flatpak/flatpak/commit/e13dfeda330625d2fecc3a54672dfd4dc9c83a5c  \"common: Fix return value and typos in flatpak_switch_symlink_and_remove\"\n\n  *   f6c8fb5 https://github.com/flatpak/flatpak/commit/f6c8fb5fdb3737e2f45068afe12c4bf1d808fd55  \"common: Use fd-based operations in flatpak_switch_symlink_and_remove\"\n\n  *   76c9296 https://github.com/flatpak/flatpak/commit/76c9296b6780ca67f44cf67f0823f086d692a592  \"run: Harden regenerate_ld_cache against symlink attacks\"\n\n\n\n\nFor LTS operating system distributions, backports of these changes are available in the flatpak-1.16.x\n branch. Please note that cherry-picked libglnx changes \"chase: Add \ninternal glnx_chaseat_full for a strategic callback\" and \"chase: Add \nglnx_chase_and_mkdirat\" are also required."
        }
      ],
      "x_generator": {
        "engine": "CVE-Request-form 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-96807",
    "datePublished": "2026-09-23T16:54:16.931Z",
    "dateReserved": "2026-09-23T16:54:16.535Z",
    "dateUpdated": "2026-09-23T16:54:16.931Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}