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    CVE-2026-9669

    bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash the process when processing untrusted data.

    Published:Jun 8, 2026
    Last Modified:Aug 11, 2026
    EPS:Jun 8, 2026
    EPSS Score:0.00428
    CVSS Score:5.9

    Affected Products

    Vendor
    Python
    Product
    Cpython

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    References

    https://github.com/python/cpython/commit/157a5df8cb5d82b33f918a7489e72ce95ceb12b6
    https://github.com/python/cpython/commit/1ba6135eae75ad8413413caeeedb56ae72320636
    https://github.com/python/cpython/commit/5755d0f083949ff3c5bf3a37e673e24e306b036e
    https://github.com/python/cpython/commit/619a12b2e545391dc436b3af79dda22337382a6f
    https://github.com/python/cpython/commit/938ec030e90c5e53f1faac6fab1643f14e4f4a79
    https://github.com/python/cpython/commit/991e6cf86496718c4ef00b362d640e00cb5c85b2
    https://github.com/python/cpython/commit/d3ca26983dfbccdf609f24ff5877dc3118e4702d
    https://github.com/python/cpython/issues/150599
    https://github.com/python/cpython/pull/150600
    https://mail.python.org/archives/list/[email protected]/thread/DBJZETMGUIFK7DVUWMOXHD3Z6IX2QPSX/
    http://www.openwall.com/lists/oss-security/2026/06/08/17

    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