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CVE-2026-44660— UltraJSON: Memory Leak in ujson.dump() on Write Failure

AI Predicted 5.5 Difficulty: Easy

Possible ATT&CK Techniques 1AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2026-44660

Vulnerability Information
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Vulnerability Title
UltraJSON: Memory Leak in ujson.dump() on Write Failure
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
ultrajsonultrajson < 5.12.1 -

II. Public POCs for CVE-2026-44660

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III. Intelligence Information for CVE-2026-44660

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Patches & Fixes for CVE-2026-44660 (1)

Vendor Advisories for CVE-2026-44660 (1)

Vendor Pages for CVE-2026-44660 (1)

IV. Related Vulnerabilities

Same product: ultrajson
Same vendor: ultrajson
Same weakness: CWE-401

V. Comments for CVE-2026-44660

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