CVE-2026-96807 (GCVE-0-2026-96807)
Vulnerability from cvelistv5 – Published: 2026-09-23 16:54 – Updated: 2026-09-26 22:51
VLAI
EPSS
VEX
Summary
In Flatpak before 1.18.1, a malicious sandboxed app can replace ~/.var/app/$appid/.ld.so with a symlink, causing regenerate_ld_cache to write files at an arbitrary location. The filenames and content are not attacker controlled, making this hard to exploit.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-26 22:45 UTC
CWE
- CWE-61 - UNIX Symbolic Link (Symlink) Following
Assigner
References
1 reference
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-96807",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-26T22:45:37.260895Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-26T22:51:21.873Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"platforms": [
"Linux"
],
"product": "Flatpak",
"programFiles": [
"common/flatpak-run.c"
],
"programRoutines": [
{
"name": "regenerate_ld_cache"
}
],
"repo": "https://github.com/flatpak/flatpak",
"vendor": "Flatpak",
"versions": [
{
"lessThan": "1.18.1",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.18.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In Flatpak before 1.18.1, a malicious sandboxed app can replace ~/.var/app/$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": "\u003cp\u003eThe issue has been fixed in version 1.18.1 by commits:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/e13dfeda330625d2fecc3a54672dfd4dc9c83a5c\"\u003ee13dfed\u003c/a\u003e \"common: Fix return value and typos in flatpak_switch_symlink_and_remove\"\u003c/li\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/f6c8fb5fdb3737e2f45068afe12c4bf1d808fd55\"\u003ef6c8fb5\u003c/a\u003e \"common: Use fd-based operations in flatpak_switch_symlink_and_remove\"\u003c/li\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/76c9296b6780ca67f44cf67f0823f086d692a592\"\u003e76c9296\u003c/a\u003e \"run: Harden regenerate_ld_cache against symlink attacks\"\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eFor LTS operating system distributions, backports of these changes are available in the \u003ccode\u003eflatpak-1.16.x\u003c/code\u003e\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.\u003c/p\u003e"
}
],
"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": "2026-09-26T22:51:21.873Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-96807",
"date": "2026-10-01",
"epss": "0.00123",
"percentile": "0.01781"
},
"nvd": {
"cve": {
"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": "2026-09-26T23:16:42.380",
"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"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-96807",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-26T22:45:37.260895Z",
"version": "2.0.3"
}
}
]
},
"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": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-61"
}
],
"source": "cve@mitre.org",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-23T18:32:24+00:00",
"cve": "CVE-2026-96807",
"id": "CVE-2026-96807",
"initial_release_date": "2026-09-23T16:54:16.931000+00:00",
"product_status:known_affected": "23",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "flatpak: Flatpak: Low integrity or availability impact via symlink manipulation",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96807.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-96807",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-26T22:45:37.260895Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-26T22:49:06.208Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"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": "\u003cp\u003eThe issue has been fixed in version 1.18.1 by commits:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/e13dfeda330625d2fecc3a54672dfd4dc9c83a5c\"\u003ee13dfed\u003c/a\u003e \"common: Fix return value and typos in flatpak_switch_symlink_and_remove\"\u003c/li\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/f6c8fb5fdb3737e2f45068afe12c4bf1d808fd55\"\u003ef6c8fb5\u003c/a\u003e \"common: Use fd-based operations in flatpak_switch_symlink_and_remove\"\u003c/li\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/76c9296b6780ca67f44cf67f0823f086d692a592\"\u003e76c9296\u003c/a\u003e \"run: Harden regenerate_ld_cache against symlink attacks\"\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eFor LTS operating system distributions, backports of these changes are available in the \u003ccode\u003eflatpak-1.16.x\u003c/code\u003e\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.\u003c/p\u003e"
}
],
"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": "2026-09-26T22:51:21.873Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
Loading…
Loading…
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.
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.
Loading…
Related by attack behaviour
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.
Loading…