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    CVE-2025-8194

    There is a defect in the CPython “tarfile” module affecting the “TarFile” extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. This vulnerability can be mitigated by including the following patch after importing the “tarfile” module:  https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1

    Published:Jul 28, 2025
    Last Modified:Apr 22, 2026
    EPS:Jul 28, 2025
    EPSS Score:0.00249
    CVSS Score:7.5

    Affected Products

    Vendor
    Python
    Product
    Cpython

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-15310 (CVSS 2.1) — When decompressing crafted zip files using the bzip/LZMA/Zstandard compressions, Python could use an attacke…
    CVE-2026-19672 (CVSS 6.3) — The tarfile module's tar and data extraction filters created directories outside the destination for members…
    CVE-2026-15806 (CVSS 6) — The HTTPPasswordMgr class in the urllib.request module, along with its subclasses HTTPPasswordMgrWithDefaultRe…
    CVE-2026-17084 (CVSS 6) — The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unico…
    CVE-2026-18503 (CVSS 2.4) — Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and …
    CVE-2026-6879 (CVSS 2) — `Element.findall()` and fully-consumed `Element.iterfind()` exhibit `O(n^2)` time complexity when using XPath …
    CVE-2026-15308 (CVSS 8.7) — The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated untermi…
    CVE-2026-4360 (CVSS 2) — In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An a…
    CVE-2026-11972 (CVSS 8.2) — When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not …
    CVE-2026-0864 (CVSS 4.1) — When using the "configparser" module to write configuration files containing multi-line text values with carri…

    References

    https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1
    https://github.com/python/cpython/commit/57f5981d6260ed21266e0c26951b8564cc252bc2
    https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38
    https://github.com/python/cpython/commit/73f03e4808206f71eb6b92c579505a220942ef19
    https://github.com/python/cpython/commit/b4ec17488eedec36d3c05fec127df71c0071f6cb
    https://github.com/python/cpython/commit/c9d9f78feb1467e73fd29356c040bde1c104f29f
    https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe
    https://github.com/python/cpython/commit/fbc2a0ca9ac8aff6887f8ddf79b87b4510277227
    https://github.com/python/cpython/issues/130577
    https://github.com/python/cpython/pull/137027
    https://mail.python.org/archives/list/[email protected]/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/
    http://www.openwall.com/lists/oss-security/2025/07/28/1
    http://www.openwall.com/lists/oss-security/2025/07/28/2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
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    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High