VYPR
High severityGHSA Advisory· Published Oct 30, 2025· Updated Apr 15, 2026

CVE-2025-12060

CVE-2025-12060

Description

The keras.utils.get_file API in Keras, when used with the extract=True option for tar archives, is vulnerable to a path traversal attack. The utility uses Python's tarfile.extractall function without the filter="data" feature. A remote attacker can craft a malicious tar archive containing special symlinks, which, when extracted, allows them to write arbitrary files to any location on the filesystem outside of the intended destination folder. This vulnerability is linked to the underlying Python tarfile weakness, identified as CVE-2025-4517. Note that upgrading Python to one of the versions that fix CVE-2025-4517 (e.g. Python 3.13.4) is not enough. One additionally needs to upgrade Keras to a version with the fix (Keras 3.12).

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
kerasPyPI
< 3.12.03.12.0

Affected products

1

Patches

1
47fcb397ee4c

Use `filter="data"` option of `TarFile.extractall`. (#21760)

https://github.com/keras-team/kerashertschuhOct 21, 2025via ghsa
3 files changed · +54 16
  • keras/src/saving/saving_lib.py+1 1 modified
    @@ -943,7 +943,7 @@ def __init__(self, root_path, archive=None, mode=None):
             if self.archive:
                 self.tmp_dir = get_temp_dir()
                 if self.mode == "r":
    -                self.archive.extractall(path=self.tmp_dir)
    +                file_utils.extract_open_archive(self.archive, self.tmp_dir)
                 self.working_dir = file_utils.join(
                     self.tmp_dir, self.root_path
                 ).replace("\\", "/")
    
  • keras/src/utils/file_utils.py+49 11 modified
    @@ -2,6 +2,7 @@
     import os
     import re
     import shutil
    +import sys
     import tarfile
     import tempfile
     import urllib
    @@ -52,17 +53,32 @@ def is_link_in_dir(info, base):
         return is_path_in_dir(info.linkname, base_dir=tip)
     
     
    -def filter_safe_paths(members):
    +def filter_safe_zipinfos(members):
         base_dir = resolve_path(".")
         for finfo in members:
             valid_path = False
    -        if is_path_in_dir(finfo.name, base_dir):
    +        if is_path_in_dir(finfo.filename, base_dir):
                 valid_path = True
                 yield finfo
    -        elif finfo.issym() or finfo.islnk():
    +        if not valid_path:
    +            warnings.warn(
    +                "Skipping invalid path during archive extraction: "
    +                f"'{finfo.name}'.",
    +                stacklevel=2,
    +            )
    +
    +
    +def filter_safe_tarinfos(members):
    +    base_dir = resolve_path(".")
    +    for finfo in members:
    +        valid_path = False
    +        if finfo.issym() or finfo.islnk():
                 if is_link_in_dir(finfo, base_dir):
                     valid_path = True
                     yield finfo
    +        elif is_path_in_dir(finfo.name, base_dir):
    +            valid_path = True
    +            yield finfo
             if not valid_path:
                 warnings.warn(
                     "Skipping invalid path during archive extraction: "
    @@ -71,6 +87,35 @@ def filter_safe_paths(members):
                 )
     
     
    +def extract_open_archive(archive, path="."):
    +    """Extracts an open tar or zip archive to the provided directory.
    +
    +    This function filters unsafe paths during extraction.
    +
    +    Args:
    +        archive: The archive object, either a `TarFile` or a `ZipFile`.
    +        path: Where to extract the archive file.
    +    """
    +    if isinstance(archive, zipfile.ZipFile):
    +        # Zip archive.
    +        archive.extractall(
    +            path, members=filter_safe_zipinfos(archive.infolist())
    +        )
    +    else:
    +        # Tar archive.
    +        extractall_kwargs = {}
    +        # The `filter="data"` option was added in Python 3.12. It became the
    +        # default starting from Python 3.14. So we only specify it between
    +        # those two versions.
    +        if sys.version_info >= (3, 12) and sys.version_info < (3, 14):
    +            extractall_kwargs = {"filter": "data"}
    +        archive.extractall(
    +            path,
    +            members=filter_safe_tarinfos(archive),
    +            **extractall_kwargs,
    +        )
    +
    +
     def extract_archive(file_path, path=".", archive_format="auto"):
         """Extracts an archive if it matches a support format.
     
    @@ -112,14 +157,7 @@ def extract_archive(file_path, path=".", archive_format="auto"):
             if is_match_fn(file_path):
                 with open_fn(file_path) as archive:
                     try:
    -                    if zipfile.is_zipfile(file_path):
    -                        # Zip archive.
    -                        archive.extractall(path)
    -                    else:
    -                        # Tar archive, perhaps unsafe. Filter paths.
    -                        archive.extractall(
    -                            path, members=filter_safe_paths(archive)
    -                        )
    +                    extract_open_archive(archive, path)
                     except (tarfile.TarError, RuntimeError, KeyboardInterrupt):
                         if os.path.exists(path):
                             if os.path.isfile(path):
    
  • keras/src/utils/file_utils_test.py+4 4 modified
    @@ -142,7 +142,7 @@ def test_member_within_base_dir(self):
             with tarfile.open(self.tar_path, "w") as tar:
                 tar.add(__file__, arcname="safe_path.txt")
             with tarfile.open(self.tar_path, "r") as tar:
    -            members = list(file_utils.filter_safe_paths(tar.getmembers()))
    +            members = list(file_utils.filter_safe_tarinfos(tar.getmembers()))
                 self.assertEqual(len(members), 1)
                 self.assertEqual(members[0].name, "safe_path.txt")
     
    @@ -156,7 +156,7 @@ def test_symlink_within_base_dir(self):
             with tarfile.open(self.tar_path, "w") as tar:
                 tar.add(symlink_path, arcname="symlink.txt")
             with tarfile.open(self.tar_path, "r") as tar:
    -            members = list(file_utils.filter_safe_paths(tar.getmembers()))
    +            members = list(file_utils.filter_safe_tarinfos(tar.getmembers()))
                 self.assertEqual(len(members), 1)
                 self.assertEqual(members[0].name, "symlink.txt")
             os.remove(symlink_path)
    @@ -173,7 +173,7 @@ def test_invalid_path_warning(self):
                 )  # Path intended to be outside of base dir
             with tarfile.open(self.tar_path, "r") as tar:
                 with patch("warnings.warn") as mock_warn:
    -                _ = list(file_utils.filter_safe_paths(tar.getmembers()))
    +                _ = list(file_utils.filter_safe_tarinfos(tar.getmembers()))
                     warning_msg = (
                         "Skipping invalid path during archive extraction: "
                         "'../../invalid.txt'."
    @@ -196,7 +196,7 @@ def test_symbolic_link_in_base_dir(self):
                 tar.add(symlink_path, arcname="symlink.txt")
     
             with tarfile.open(self.tar_path, "r") as tar:
    -            members = list(file_utils.filter_safe_paths(tar.getmembers()))
    +            members = list(file_utils.filter_safe_tarinfos(tar.getmembers()))
                 self.assertEqual(len(members), 1)
                 self.assertEqual(members[0].name, "symlink.txt")
                 self.assertTrue(
    

Vulnerability mechanics

Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

7

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