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    CVE-2026-87910

    When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.

    Published:Sep 11, 2026
    Last Modified:Oct 2, 2026
    EPS:Sep 11, 2026
    EPSS Score:0.00549
    CVSS Score:5.7

    Affected Products

    Vendor
    Python
    Product
    Cpython

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-114583 (CVSS 6.9) — tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-li…
    CVE-2026-19553 (CVSS 7.6) — ssl.SSLContext.wrap_bio() didn't require the server_hostname argument to not be None if ssl.SSLContext.check_h…
    CVE-2026-19445 (CVSS 9.2) — A remote, unauthenticated TLS client can make a server crash or call through a freed pointer if its sni_callba…
    CVE-2026-12345 (CVSS 5.9) — The cleanup of tempfile.TemporaryDirectory is vulnerable to a race condition. An attacker who can modify the t…
    CVE-2026-82049 (CVSS 8.4) — In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted ar…
    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…

    References

    https://github.com/python/cpython/commit/2eb0c2f1dc71847731b6ab30aebefd058d482a7f
    https://github.com/python/cpython/commit/3105a3498aaf681ce128cf5baf83c2e5574267c5
    https://github.com/python/cpython/commit/764fd0af8d9e19d3684a58d2e58bf770f0605036
    https://github.com/python/cpython/commit/9c17bace90f88dfba6d0e2fe23c8e7ae35f83955
    https://github.com/python/cpython/commit/a4919937a4e1e69a0d178909c6f20557eca5d1d0
    https://github.com/python/cpython/commit/c1f106d240c4ffcb3608ed0a20e8aba6c865f6d3
    https://github.com/python/cpython/commit/d9565e54b1fc6d63c5be9afd58114499128fa57b
    https://github.com/python/cpython/commit/fb2f0bbc3b35264f09cc2cb2934b7987527a6bc2
    https://github.com/python/cpython/issues/157265
    https://github.com/python/cpython/pull/157266
    https://mail.python.org/archives/list/[email protected]/thread/57TBTLL2W6APMZR3A25B2YV7GL3EPTDJ/
    http://www.openwall.com/lists/oss-security/2026/09/11/8

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-87910 — Python (Medium 5.7) | CVE-DB