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    CVE-2026-42309

    Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This issue has been patched in version 12.2.0.

    Published:May 9, 2026
    Last Modified:May 12, 2026
    EPS:May 9, 2026
    EPSS Score:0.00014
    CVSS Score:5.5

    Affected Products

    Vendor
    Python
    Product
    Pillow
    Vendor
    Python-pillow
    Product
    Pillow

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-122 Heap-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

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    CVE-2026-25990 (CVSS 8.6) — Pillow is a Python imaging library. From 10.3.0 to before 12.1.1, an out-of-bounds write may be triggered when…
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    CVE-2023-44271 (CVSS 7.5) — An issue was discovered in Pillow before 10.0.0. It is a Denial of Service that uncontrollably allocates memor…
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    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