CVE-2025-4517

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See the tarfile <a target=\"_blank\" rel=\"nofollow\" href=\"https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter\">extraction filters documentation</a>&nbsp;for more information.</p><p>Note that for Python 3.14 or later the default value of <code>filter=</code>&nbsp;changed from \"no filtering\" to `\"data\", so if you are relying on this new default behavior then your usage is also affected.</p><p>Note that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. 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See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter \u00a0for more information.\n\nNote that for Python 3.14 or later the default value of filter=\u00a0changed from \"no filtering\" to `\"data\", so if you are relying on this new default behavior then your usage is also affected.\n\nNote that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. 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See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter \u00a0for more information.\n\nNote that for Python 3.14 or later the default value of filter=\u00a0changed from \"no filtering\" to `\"data\", so if you are relying on this new default behavior then your usage is also affected.\n\nNote that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.", "supportingMedia": [{"type": "text/html", "value": "<p><span style=\"background-color: rgb(255, 255, 255);\">Allows arbitrary filesystem writes outside the extraction directory during extraction with </span><code>filter=\"data\"</code><span style=\"background-color: rgb(255, 255, 255);\">.</span><br></p><p>You are affected by this vulnerability if using the <code>tarfile</code>&nbsp;module to extract untrusted tar archives using <code>TarFile.extractall()</code>&nbsp;or <code>TarFile.extract()</code>&nbsp;using the <code>filter=</code>&nbsp;parameter with a value of <code>\"data\"</code>&nbsp;or <code>\"tar\"</code>. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "modules": ["tarfile"], "product": "CPython", "repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "versions": [{"lessThan": "3.9.23", "status": "affected", "version": "0", "versionType": "python"}, {"lessThan": "3.10.18", "status": "affected", "version": "3.10.0", "versionType": "python"}, {"lessThan": "3.11.13", "status": "affected", "version": "3.11.0", "versionType": "python"}, {"lessThan": "3.12.11", "status": "affected", "version": "3.12.0", "versionType": "python"}, {"lessThan": "3.13.4", "status": "affected", "version": "3.13.0", "versionType": "python"}, {"lessThan": "3.14.0b3", "status": "affected", "version": "3.14.0a1", "versionType": "python"}]}], "source": "cna@python.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Allows arbitrary filesystem writes outside the extraction directory during extraction with filter=\"data\".\n\n\nYou are affected by this vulnerability if using the tarfile\u00a0module to extract untrusted tar archives using TarFile.extractall()\u00a0or TarFile.extract()\u00a0using the filter=\u00a0parameter with a value of \"data\"\u00a0or \"tar\". See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter \u00a0for more information.\n\nNote that for Python 3.14 or later the default value of filter=\u00a0changed from \"no filtering\" to `\"data\", so if you are relying on this new default behavior then your usage is also affected.\n\nNote that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links."}, {"lang": "es", "value": "Permite escrituras arbitrarias en el sistema de archivos fuera del directorio de extracci\u00f3n durante la extracci\u00f3n con filter=\"data\". Esta vulnerabilidad afecta al usuario si utiliza el m\u00f3dulo tarfile para extraer archivos tar no confiables mediante TarFile.extractall() o TarFile.extract() y el par\u00e1metro filter= con el valor \"data\" o \"tar\". Consulte la documentaci\u00f3n sobre filtros de extracci\u00f3n de archivos tar (https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter) para obtener m\u00e1s informaci\u00f3n. Solo las versiones de Python 3.12 o posteriores se ven afectadas por estas vulnerabilidades; las versiones anteriores no incluyen la funci\u00f3n de filtro de extracci\u00f3n. Tenga en cuenta que, para Python 3.14 o posteriores, el valor predeterminado de filter= cambi\u00f3 de \"sin filtrado\" a \"data\", por lo que si utiliza este nuevo comportamiento predeterminado, su uso tambi\u00e9n se ver\u00e1 afectado. Tenga en cuenta que ninguna de estas vulnerabilidades afecta significativamente la instalaci\u00f3n de distribuciones fuente que son archivos tar, ya que estas permiten la ejecuci\u00f3n de c\u00f3digo arbitrario durante el proceso de compilaci\u00f3n. Sin embargo, al evaluar distribuciones de origen es importante evitar instalar distribuciones de origen con enlaces sospechosos."}], "id": "CVE-2025-4517", "lastModified": "2026-07-31T14:16:44.957", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 9.4, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.5, "source": "cna@python.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-4517", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-10-24T03:55:18.283911Z", "version": "2.0.3"}}]}, "published": "2025-06-03T13:15:20.837", "references": [{"source": "cna@python.org", "url": "https://gist.github.com/sethmlarson/52398e33eff261329a0180ac1d54f42f"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/19de092debb3d7e832e5672cc2f7b788d35951da"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/28463dba112af719df1e8b0391c46787ad756dd9"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/3612d8f51741b11f36f8fb0494d79086bac9390a"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/4633f3f497b1ff70e4a35b6fe2c907cbe2d4cb2e"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/9c1110ef6652687d7c55f590f909720eddde965a"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/9e0ac76d96cf80b49055f6d6b9a6763fb9215c2a"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/aa9eb5f757ceff461e6e996f12c89e5d9b583b01"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/dd8f187d0746da151e0025c51680979ac5b4cfb1"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/issues/135034"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/pull/135037"}, {"source": "cna@python.org", "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/MAXIJJCUUMCL7ATZNDVEGGHUMQMUUKLG/"}], "sourceIdentifier": "cna@python.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "cna@python.org", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:10140", "cpe": "cpe:/o:redhat:enterprise_linux:10.0", "package": "python3.12-0:3.12.9-2.el10_0.2", "product_name": "Red Hat Enterprise Linux 10", "release_date": "2025-07-01T00:00:00Z"}, {"advisory": "RHSA-2025:10026", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "python3.11-0:3.11.13-1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-07-01T00:00:00Z"}, {"advisory": "RHSA-2025:10031", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "python3.12-0:3.12.11-1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-07-01T00:00:00Z"}, {"advisory": "RHSA-2025:10128", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "python3-0:3.6.8-70.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-07-01T00:00:00Z"}, {"advisory": "RHSA-2025:10128", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "python3-0:3.6.8-70.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-07-01T00:00:00Z"}, {"advisory": "RHSA-2025:10484", "cpe": "cpe:/a:redhat:rhel_aus:8.6", "package": "python3-0:3.6.8-47.el8_6.8", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2025-07-07T00:00:00Z"}, {"advisory": "RHSA-2025:10484", "cpe": "cpe:/a:redhat:rhel_eus_long_life:8.6", "package": "python3-0:3.6.8-47.el8_6.8", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support EXTENSION", "release_date": "2025-07-07T00:00:00Z"}, {"advisory": "RHSA-2025:10484", "cpe": "cpe:/a:redhat:rhel_tus:8.6", "package": "python3-0:3.6.8-47.el8_6.8", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2025-07-07T00:00:00Z"}, {"advisory": "RHSA-2025:10484", "cpe": "cpe:/a:redhat:rhel_e4s:8.6", "package": "python3-0:3.6.8-47.el8_6.8", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2025-07-07T00:00:00Z"}, {"advisory": "RHSA-2025:10602", "cpe": "cpe:/a:redhat:rhel_eus_long_life:8.8", "package": "python3-0:3.6.8-51.el8_8.10", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support EXTENSION", "release_date": "2025-07-08T00:00:00Z"}, {"advisory": "RHSA-2025:10602", "cpe": "cpe:/a:redhat:rhel_tus:8.8", "package": "python3-0:3.6.8-51.el8_8.10", "product_name": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service", "release_date": "2025-07-08T00:00:00Z"}, {"advisory": "RHSA-2025:10602", "cpe": "cpe:/a:redhat:rhel_e4s:8.8", "package": "python3-0:3.6.8-51.el8_8.10", "product_name": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions", "release_date": "2025-07-08T00:00:00Z"}, {"advisory": "RHSA-2025:10136", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "python3.9-0:3.9.21-2.el9_6.1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-07-01T00:00:00Z"}, {"advisory": "RHSA-2025:10148", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "python3.11-0:3.11.11-2.el9_6.1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-07-01T00:00:00Z"}, {"advisory": "RHSA-2025:10189", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "python3.12-0:3.12.9-1.el9_6.1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-07-02T00:00:00Z"}, {"advisory": "RHSA-2025:10136", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "python3.9-0:3.9.21-2.el9_6.1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-07-01T00:00:00Z"}, {"advisory": "RHSA-2025:10028", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "python3.12-0:3.12.1-4.el9_4.6", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-07-01T00:00:00Z"}, {"advisory": "RHSA-2025:10399", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "python3.9-0:3.9.18-3.el9_4.8", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-07-07T00:00:00Z"}, {"advisory": "RHSA-2025:9918", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "python3.11-0:3.11.7-1.el9_4.8", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-06-30T00:00:00Z"}], "bugzilla": {"description": "python: cpython: Arbitrary writes via tarfile realpath overflow", "id": "2370016", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2370016"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L", "status": "verified"}, "cwe": "CWE-22", "details": ["Allows arbitrary filesystem writes outside the extraction directory during extraction with filter=\"data\".\nYou are affected by this vulnerability if using the tarfile\u00a0module to extract untrusted tar archives using TarFile.extractall()\u00a0or TarFile.extract()\u00a0using the filter=\u00a0parameter with a value of \"data\"\u00a0or \"tar\". See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter \u00a0for more information.\nNote that for Python 3.14 or later the default value of filter=\u00a0changed from \"no filtering\" to `\"data\", so if you are relying on this new default behavior then your usage is also affected.\nNote that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.", "A flaw was found in the CPython tarfile module. This vulnerability allows arbitrary filesystem writes outside the extraction directory via extracting untrusted tar archives using the TarFile.extractall() or TarFile.extract() methods with the extraction filter parameter set to \"data\" or \"tar\"."], "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-2025-4517", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "python36:3.6/python36", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2025-06-03T12:58:50Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-4517\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-4517\nhttps://gist.github.com/sethmlarson/52398e33eff261329a0180ac1d54f42f\nhttps://github.com/python/cpython/commit/3612d8f51741b11f36f8fb0494d79086bac9390a\nhttps://github.com/python/cpython/commit/9e0ac76d96cf80b49055f6d6b9a6763fb9215c2a\nhttps://github.com/python/cpython/issues/135034\nhttps://github.com/python/cpython/pull/135037\nhttps://mail.python.org/archives/list/security-announce@python.org/thread/MAXIJJCUUMCL7ATZNDVEGGHUMQMUUKLG/"], "statement": "The severity of this vulnerability was lowered due to the fact that successful exploitation requires the attacker to convince a privileged user or process to extract a malicious tar file. Since tar file extraction typically occurs in trusted contexts or with elevated privileges, the impact is reduced by the requirement of such access.\nVersions of python36:3.6/python36 as shipped with Red Hat Enterprise Linux 8 are marked as 'Not affected' as they just provide \"symlinks\" to the main python3 component, which provides the actual interpreter of the Python programming language.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-22T12:10:16.952646+00:00", "value": {"mitigation_remediation": ["Upgrade CPython to the most recent stable release that includes the fix (consult CPython changelog or release notes for the relevant commit).", "If an upgrade is not possible, enforce a safer extraction filter by explicitly specifying filter=\"safe\" or replacing the default filter behavior with a custom implementation that validates extracted paths.", "Review code that processes untrusted tar archives and restrict or sandbox the extraction process, ensuring the process has minimal privileges; use a dedicated, unprivileged user for extraction when possible."], "summary": {"action": "Immediate Patch", "impact": "Unrestricted file writes outside the intended extraction directory."}, "threat_synthesis": {"affected_systems": "The flaw is present in CPython, the standard Python interpreter, for versions that allow the use of tarfile with the filter parameter set to 'data' or 'tar'. Since Python\u00a03.14 changed the default filter to 'data', this vulnerability affects all installations running Python\u00a03.14 or later when the default extraction behavior is used. Earlier Python versions are affected only when applications explicitly pass filter='data' or filter='tar'. The vulnerability does not depend on any particular operating\u2011system runtime and is therefore relevant to any platform that runs CPython, including Red\u00a0Hat Enterprise\u00a0Linux families and other distributions.", "description_and_impact": "The vulnerability arises from a logic flaw in Python\u2019s tarfile module that resolves extraction paths without properly sanitizing them, allowing attackers to craft archive entries that resolve to paths outside the intended extraction directory. When an archive is extracted with the filter parameter set to 'data' or 'tar' \u2013 which is also the default from Python\u00a03.14 onward \u2013 the library expands paths using an insecure realpath algorithm. As a result, an adversary can extract files to any location within the process\u2019s writable filesystem, enabling arbitrary overwrite or creation of files. This represents a CWE\u201122 path traversal flaw and can be leveraged for modifications or persistence.", "risk_and_exploitability": "The CVSS score of 9.4 indicates a severe impact if exploited. The EPSS score is below 1\u202f%, suggesting a low present exploitation probability, and the issue is not listed in the CISA KEV catalog. Based on the description, the likely attack vector is an attacker supplying a malicious tar archive to a Python process that calls TarFile.extractall or TarFile.extract with a safe filter. In practice this could occur when a software component or user processes untrusted archives, for instance during package installation or data import. A locally running Python process, especially one with elevated privileges, could modify or create arbitrary files, potentially leading to privilege escalation or persistence."}}}}, "created": "2025-06-24T09:44:16.711555+00:00", "updated": "2026-04-22T12:15:16.050962+00:00", "vendors": ["python", "python$PRODUCT$cpython"]}