CVE-2026-7774

Summary

tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.

Affected Software

Weaknesses

• CWE-22: CWE-22

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2026/06/04/9

References

• https://github.com/python/cpython/pull/149487
• https://github.com/python/cpython/issues/149486
• https://mail.python.org/archives/list/security-announce@python.org/thread/4FU62L2M6RMMHT2QPGQNPEHHUND7CEX5/
• https://github.com/python/cpython/commit/0478bd83d82b255e0f29f613367a59d261e7eaa2
• https://github.com/python/cpython/commit/0d28f5e46e151718972dfabd91205444d0037b6d
• https://github.com/python/cpython/commit/578411982c16f753f4893532510099ef665117da
• https://github.com/python/cpython/commit/5cf47a248c35c375d610b87b2f72fd1ed454b558
• https://github.com/python/cpython/commit/74cca9a92fb7d653e404843a56b8bdc7b0afdbbf

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