What’s Vulnerable › Vulnerabilities

CVE-2025-13462: tarfile: Skip DIRTYPE normalization during GNU LONGNAME/LONGLINK handling

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-12 · updated 2026-08-13
• Weakness: CWE-20

Description

The "tarfile" module would still apply normalization of AREGTYPE (\x00) blocks to DIRTYPE, even while processing a multi-block member such as GNUTYPE_LONGNAME or GNUTYPE_LONGLINK. This could result in a crafted tar archive being misinterpreted by the tarfile module compared to other implementations.

Affected products

• Python: before 3.13.13; from 3.14.0 before 3.14.4; 3.15.0-alpha1, 3.15.0-alpha2, 3.15.0-alpha3, 3.15.0-alpha4, 3.15.0-alpha5, 3.15.0-alpha6 (+1) — fixed in 3.13.13, 3.14.4

How to fix

Upgrade to a fixed version: Python 3.13.13, 3.14.4. Check the vendor advisory for mitigations.

References

• https://github.com/python/cpython/commit/42d754e34c06e57ad6b8e7f92f32af679912d8ab
• https://github.com/python/cpython/commit/72dde1016493c52abe857fc4a7bf6c40138b4114
• https://github.com/python/cpython/commit/7ad3093d76a748af55bdb1d2e8aad3638163b017
• https://github.com/python/cpython/commit/9a23b753552afa28e3a2f4d8863572fc66479406
• https://github.com/python/cpython/commit/ae99fe3a33b43e303a05f012815cef60b611a9c7
• https://github.com/python/cpython/commit/d10950739a78f54d0718d88fb5a868374603c084
• https://github.com/python/cpython/issues/141707
• https://github.com/python/cpython/pull/143934
• https://mail.python.org/archives/list/security-announce@python.org/thread/EOMI5I66ZMKQ2INNFT6T7IAIKUGPZYIE/

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