CVE-2026-14534

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Because these modules are absent from the denylist, fickling's check_safety() function returns LIKELY_SAFE with zero findings for pickle payloads that invoke dangerous functions including _posixsubprocess.fork_exec (C-level process spawner capable of executing arbitrary binaries), site.execsitecustomize (executes arbitrary site customization code), and atexit._run_exitfuncs (triggers all registered exit handler callbacks). The fickling.load() API chains check_safety() into pickle.loads() as an explicit security gate; a LIKELY_SAFE verdict causes the payload to be deserialized and executed. This shares the same root cause as CVE-2026-22607 (cProfile), CVE-2025-67748 (pty), and CVE-2025-67747 (marshal/types). OvertlyBadEvals does not flag these modules because they are standard library imports. UnsafeImports does not flag them because they are not in the denylist. The UnusedVariables heuristic is defeated by the SETITEMS opcode pattern."}, {"lang": "es", "value": "Las versiones de fickling de Trail of Bits hasta la 0.1.10 inclusive no incluyen los m\u00f3dulos de la biblioteca est\u00e1ndar de Python _posixsubprocess, site y atexit en la lista de denegaci\u00f3n UNSAFE_IMPORTS (fickle.py). Debido a que estos m\u00f3dulos est\u00e1n ausentes de la lista de denegaci\u00f3n, la funci\u00f3n check_safety() de fickling devuelve LIKELY_SAFE con cero hallazgos para cargas \u00fatiles de pickle que invocan funciones peligrosas, incluyendo _posixsubprocess.fork_exec (generador de procesos a nivel de C capaz de ejecutar binarios arbitrarios), site.execsitecustomize (ejecuta c\u00f3digo de personalizaci\u00f3n de sitio arbitrario) y atexit._run_exitfuncs (activa todas las devoluciones de llamada de los gestores de salida registrados). La API fickling.load() encadena check_safety() en pickle.loads() como una puerta de seguridad expl\u00edcita; un veredicto LIKELY_SAFE hace que la carga \u00fatil sea deserializada y ejecutada. Esto comparte la misma causa ra\u00edz que CVE-2026-22607 (cProfile), CVE-2025-67748 (pty) y CVE-2025-67747 (marshal/types). OvertlyBadEvals no marca estos m\u00f3dulos porque son importaciones de la biblioteca est\u00e1ndar. UnsafeImports no los marca porque no est\u00e1n en la lista de denegaci\u00f3n. La heur\u00edstica UnusedVariables es eludida por el patr\u00f3n de c\u00f3digo de operaci\u00f3n SETITEMS."}], "id": "CVE-2026-14534", "lastModified": "2026-10-25T15:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-14534", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-06T14:59:25.631510Z", "version": "2.0.3"}}]}, "published": "2026-07-04T14:16:28.400", "references": [{"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082", "tags": ["Patch"], "url": "https://github.com/trailofbits/fickling/commit/e8408615b63adf034f891f653692ab9b51f0f5af"}, {"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/trailofbits/fickling/pull/272"}, {"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082", "tags": ["Release Notes"], "url": "https://github.com/trailofbits/fickling/releases/tag/v0.1.11"}, {"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/trailofbits/fickling/security/advisories/GHSA-m6fh-58r7-x697"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/trailofbits/fickling/security/advisories/GHSA-m6fh-58r7-x697"}], "sourceIdentifier": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-184"}, {"lang": "en", "value": "CWE-502"}], "source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082", "type": "Secondary"}]}

{"bugzilla": {"description": "fickling: python: fickling: Arbitrary code execution due to incomplete denylist in deserialization", "id": "2497046", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497046"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-184", "details": ["Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules _posixsubprocess, site, and atexit in the UNSAFE_IMPORTS denylist (fickle.py). Because these modules are absent from the denylist, fickling's check_safety() function returns LIKELY_SAFE with zero findings for pickle payloads that invoke dangerous functions including _posixsubprocess.fork_exec (C-level process spawner capable of executing arbitrary binaries), site.execsitecustomize (executes arbitrary site customization code), and atexit._run_exitfuncs (triggers all registered exit handler callbacks). The fickling.load() API chains check_safety() into pickle.loads() as an explicit security gate; a LIKELY_SAFE verdict causes the payload to be deserialized and executed. This shares the same root cause as CVE-2026-22607 (cProfile), CVE-2025-67748 (pty), and CVE-2025-67747 (marshal/types). OvertlyBadEvals does not flag these modules because they are standard library imports. UnsafeImports does not flag them because they are not in the denylist. The UnusedVariables heuristic is defeated by the SETITEMS opcode pattern.", "A flaw was found in the `fickling` library, which is designed to safely handle Python pickle data. The library's security checks in versions up to and including 0.1.10 fail to properly identify and block certain dangerous Python standard library modules during deserialization. This oversight allows a remote attacker to craft a malicious data payload that, when processed, can execute arbitrary code on the system, potentially leading to full system compromise."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-14534", "package_state": [{"cpe": "cpe:/a:redhat:exploit_intelligence:0", "fix_state": "Affected", "package_name": "exploit-intelligence-tech-preview/vulnerability-analysis-rhel9", "product_name": "Exploit Intelligence"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "important", "package_name": "python3.11", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "important", "package_name": "python3.12", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "important", "package_name": "python3.13", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "important", "package_name": "python3.14", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-04T13:25:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-14534\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-14534\nhttps://github.com/trailofbits/fickling/commit/e8408615b63adf034f891f653692ab9b51f0f5af\nhttps://github.com/trailofbits/fickling/pull/272\nhttps://github.com/trailofbits/fickling/releases/tag/v0.1.11\nhttps://github.com/trailofbits/fickling/security/advisories/GHSA-m6fh-58r7-x697"], "statement": "A flaw was found in Trail of Bits fickling versions through 0.1.10, where the UNSAFE_IMPORTS denylist is missing the Python standard library modules _posixsubprocess, site, and atexit. This allows a crafted pickle payload to invoke dangerous functions such as _posixsubprocess.fork_exec (arbitrary binary execution), site.execsitecustomize (arbitrary code execution), and atexit._run_exitfuncs (triggering all registered exit handlers) while fickling's check_safety() returns LIKELY_SAFE.", "threat_severity": "Important"}

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