CVE-2025-4435

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{"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": "cpython: Tarfile extracts filtered members when errorlevel=0", "id": "2370010", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2370010"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "status": "verified"}, "cwe": "CWE-706", "details": ["When using a TarFile.errorlevel = 0\u00a0and extracting with a filter the documented behavior is that any filtered members would be skipped and not extracted. However the actual behavior of TarFile.errorlevel = 0\u00a0in affected versions is that the member would still be extracted and not skipped.", "A flaw was found in CPython's tarfile module. This vulnerability allows unauthorized file extraction via crafted tar archives when TarFile.errorlevel=0, bypassing expected filtering mechanisms."], "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-2025-4435", "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/bootc-amd-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/bootc-aws-nvidia-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/bootc-azure-amd-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/bootc-azure-nvidia-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/bootc-gcp-nvidia-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/bootc-intel-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/bootc-nvidia-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/granite-3.1-8b-lab-v2.1", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/granite-3.1-8b-starter-v2.1", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/instructlab-amd-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/instructlab-nvidia-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/modelcar-granite-3-1-8b-lab-v2-1", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:1", "fix_state": "Not affected", "package_name": "rhelai1/modelcar-granite-3-1-8b-starter-v2-1", "product_name": "Red Hat Enterprise Linux AI (RHEL AI)"}], "public_date": "2025-06-03T12:59:06Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-4435\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-4435\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": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-22T12:09:52.767717+00:00", "value": {"mitigation_remediation": ["Upgrade CPython to a release that contains the tarfile logic fix.", "Avoid setting TarFile.errorlevel = 0; instead use the default extraction behavior or apply an explicit filter before invoking extract members.", "If a patch cannot be applied immediately, perform extraction in a restricted environment (e.g., a read\u2011only chroot or container) to limit the scope of any file writes."], "summary": {"action": "Apply Patch", "impact": "Unauthorized File Extraction"}, "threat_synthesis": {"affected_systems": "The flaw resides in CPython\u2019s tarfile module. All CPython versions prior to the patch commit that introduces the fix are considered vulnerable. Red\u00a0Hat Enterprise Linux 8, 9, and their extended\u2011service releases (RHEL\u00a0EUS, RHEL\u00a0E4S, RHEL\u00a0EUS\u00a0Long\u202fLife, RHEL\u00a0TUS) that ship unpatched Python packages are at risk. Because the CVE record does not list specific CPython release numbers, users should identify which Python interpreter they are using and verify whether the version includes the commit that resolves the issue.", "description_and_impact": "When a Python TarFile instance has its errorlevel attribute set to 0, the documented behavior is that any archive entries that are filtered out should be ignored during extraction. In the affected CPython releases, however, the extraction logic fails to honor this contract and still writes the filtered members to the target directory. The result is that an attacker can supply a tar archive containing entries that are intended to be skipped, and those entries will nevertheless be extracted, potentially creating or overwriting files on the filesystem. The vulnerability stems from incorrect control flow (CWE\u2011706) and a faulty use of the filtering mechanism (CWE\u2011682), leading to unauthorized creation of files and loss of isolation between the archive contents and the application environment.", "risk_and_exploitability": "The CVSS score of 7.5 indicates high severity. The EPSS score of less than 1\u202f% and the absence from the CISA KEV catalog suggest that exploitation is currently rare, but the potential for disruptive file writes remains. The likely attack vector is an application that runs Python code and can set TarFile.errorlevel = 0 while processing a user\u2011supplied tar archive. Based on the description, it is inferred that an attacker who can control this environment can extract or overwrite files, thereby possibly exposing sensitive data or altering system configuration. Although the exploitation probability is low, the impact of unintended file creation or overwrite warrants timely remediation."}}}}, "created": "2025-06-24T09:44:16.889115+00:00", "updated": "2026-04-22T12:15:16.050566+00:00", "vendors": ["python", "python$PRODUCT$cpython"]}