CVE-2025-8194

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "CPython", "repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "versions": [{"lessThan": "3.9.24", "status": "affected", "version": "0", "versionType": "python"}, {"lessThan": "3.10.19", "status": "affected", "version": "3.10.0", "versionType": "python"}, {"lessThan": "3.11.14", "status": "affected", "version": "3.11.0", "versionType": "python"}, {"lessThan": "3.12.12", "status": "affected", "version": "3.12.0", "versionType": "python"}, {"lessThan": "3.13.6", "status": "affected", "version": "3.13.0", "versionType": "python"}, {"lessThan": "3.14.0rc2", "status": "affected", "version": "3.14.0a1", "versionType": "python"}]}], "source": "cna@python.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "There is a defect in the CPython \u201ctarfile\u201d module affecting the \u201cTarFile\u201d extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. \n\nThis vulnerability can be mitigated by including the following patch after importing the \u201ctarfile\u201d module:\u00a0 https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1"}, {"lang": "es", "value": "Existe un defecto en el m\u00f3dulo \"tarfile\" de CPython que afecta a las API de extracci\u00f3n y enumeraci\u00f3n de entradas de \"TarFile\". La implementaci\u00f3n de tar procesaba archivos tar con desplazamientos negativos sin errores, lo que resultaba en un bucle infinito y un bloqueo durante el an\u00e1lisis de archivos tar manipulados con fines maliciosos. Esta vulnerabilidad se puede mitigar incluyendo el siguiente parche despu\u00e9s de importar el m\u00f3dulo \"tarfile\": import tarfile def _block_patched(self, count): if count &lt; 0: # pragma: no cover raise tarfile.InvalidHeaderError(\"invalid offset\") return _block_patched._orig_block(self, count) _block_patched._orig_block = tarfile.TarInfo._block tarfile.TarInfo._block = _block_patched"}], "id": "CVE-2025-8194", "lastModified": "2026-07-31T14:16:45.453", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "cna@python.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-8194", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-07-28T18:57:54.114655Z", "version": "2.0.3"}}]}, "published": "2025-07-28T19:15:43.793", "references": [{"source": "cna@python.org", "url": "https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/57f5981d6260ed21266e0c26951b8564cc252bc2"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/73f03e4808206f71eb6b92c579505a220942ef19"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/b4ec17488eedec36d3c05fec127df71c0071f6cb"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/c9d9f78feb1467e73fd29356c040bde1c104f29f"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/fbc2a0ca9ac8aff6887f8ddf79b87b4510277227"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/issues/130577"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/pull/137027"}, {"source": "cna@python.org", "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2025/07/28/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2025/07/28/2"}], "sourceIdentifier": "cna@python.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "cna@python.org", "type": "Secondary"}]}

{"bugzilla": {"description": "cpython: Cpython infinite loop when parsing a tarfile", "id": "2384043", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2384043"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-835", "details": ["No description is available for this CVE."], "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-2025-8194", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "python3.12", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "python", "product_name": "Red Hat Enterprise Linux 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deferred", "package_name": "rhelai1/modelcar-granite-3-1-8b-starter-v2-1", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}], "public_date": "2025-07-28T18:42:44Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-8194\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-8194\nhttps://github.com/python/cpython/issues/130577\nhttps://github.com/python/cpython/pull/137027\nhttps://mail.python.org/archives/list/security-announce@python.org/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/"], "statement": "This flaw in Cpython's processing of tarfiles has been given a low availability impact for deployments of RedHat systems. The flaw may cause the python runtime to lock up but the rest of the system will continue to operate.", "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-22T11:26:56.228112+00:00", "value": {"mitigation_remediation": ["Apply the patch provided in the official advisory, such as the code snippet linked in the vulnerability description, immediately after any import of the tarfile module", "Upgrade to a CPython release that contains the committed fix (see the referenced GitHub commits and pull request that address the issue)", "If an upgrade is not feasible, neutralize the attack surface by rejecting tar archives with negative offsets or validating archive offsets before processing, thereby preventing the infinite loop condition."], "summary": {"action": "Patch Immediately", "impact": "Remote or Local Denial of Service via infinite loop"}, "threat_synthesis": {"affected_systems": "Python Software Foundation CPython is the affected product. All CPython releases that include the unpatched tarfile implementation are vulnerable, as the security advisory does not specify a limited version set. Systems running Python and using tarfile to extract or inspect uploaded archives are at risk.", "description_and_impact": "The vulnerability resides in CPython\u2019s tarfile module, where parsing a tar archive with a negative member offset triggers an infinite loop and deadlock in the extraction and enumeration APIs. The flaw does not disclose data but prevents the process from completing, effectively hanging the application that attempts to read or list the archive. The severity of the denial of service is reflected in a CVSS score of 7.5 and a CWE\u2010835 classification of infinite loop.", "risk_and_exploitability": "Although the exploit requires crafting a malicious tar archive, it can be achieved by an attacker who can trigger tarfile processing \u2013 potentially via a file upload interface, command\u2011line operations, or automated extraction tasks. The EPSS score of less than 1% indicates a low current exploitation probability, and the vulnerability is not listed in the CISA KEV catalog, suggesting no known widespread exploitation at the time of analysis. Still, the infinite loop can consume CPU resources until the process is killed, allowing an attacker to force a denial of service on the target system."}}}}, "created": "2025-07-29T07:59:17.540005+00:00", "updated": "2026-04-22T11:30:15.376306+00:00", "vendors": ["python", "python$PRODUCT$cpython"]}