🛡️ CVE-2026-44660
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-401 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-401
Public Exploit ✅ No
Source NVD
Published 2026-05-12
Updated 2026-06-09
Modified 2026-06-09

Affected Packages

Software From version Fixed in
ujson 5.12.1
ultrajson 5.12.1
unknown

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