CVE Feed

    Dashboard / CVE / CVE-2026-44660

    CVE-2026-44660

    UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Prior to 5.12.1, when ujson.dump() writes to a file-like object and the write operation raises an exception, the serialized JSON string object is not decremented, leaking memory. Each failed write operation leaks the full size of the serialized payload. This vulnerability is fixed in 5.12.1.

    Published:May 27, 2026
    Last Modified:Jun 2, 2026
    EPS:May 27, 2026
    EPSS Score:0.00052
    CVSS Score:7.5

    Affected Products

    Vendor
    Ultrajson
    Product
    Ultrajson
    Vendor
    Ultrajson Project
    Product
    Ultrajson

    Exploits

    https://github.com/ultrajson/ultrajson/security/advisories/GHSA-c38f-wx89-p2xghttps://github.com/ultrajson/ultrajson/security/advisories/GHSA-c38f-wx89-p2xg

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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