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    CVE-2026-7210

    `xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

    Published:May 11, 2026
    Last Modified:Aug 14, 2026
    EPS:May 11, 2026
    EPSS Score:0.00811
    CVSS Score:7.5

    Affected Products

    Vendor
    Python
    Product
    Cpython
    Vendor
    Python
    Product
    Python

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-331 Insufficient Entropy

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-59 Session Credential Falsification through Prediction

    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://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4
    https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566
    https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56
    https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640b
    https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286
    https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a
    https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f
    https://github.com/python/cpython/issues/149018
    https://github.com/python/cpython/pull/149023
    https://mail.python.org/archives/list/[email protected]/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
    http://www.openwall.com/lists/oss-security/2026/05/11/13
    http://www.openwall.com/lists/oss-security/2026/05/11/8

    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