{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-96807", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "state": "PUBLISHED", "assignerShortName": "mitre", "dateReserved": "2026-09-23T16:54:16.535Z", "datePublished": "2026-09-23T16:54:16.931Z", "dateUpdated": "2026-09-23T16:54:16.931Z"}, "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"}]}], "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": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-09-23T16:54:16.931Z"}, "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"}, "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.18.1"}]}]}]}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "cve@mitre.org"}], "cveTags": [], "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."}], "id": "CVE-2026-96807", "lastModified": "2026-09-23T17:17:25.703", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 4.0, "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"}, "exploitabilityScore": 1.4, "impactScore": 2.5, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-09-23T17:17:25.703", "references": [{"source": "cve@mitre.org", "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-99wv-m8rp-g58x"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-61"}], "source": "cve@mitre.org", "type": "Primary"}]}

{}

{"created": "2026-09-23T18:30:06.967513+00:00", "title": "Flatpak LD Cache Symlink Attack", "updated": "2026-09-23T18:30:06.967519+00:00", "vendors": [], "weaknesses": ["CWE-61"]}