Missing Release of Memory after Effective Lifetime Affecting ujson package, versions [5.4.0,5.12.0)
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- published18 Mar 2026
- disclosed18 Mar 2026
- creditCameron Criswell
Introduced: 18 Mar 2026
NewCVE-2026-32874 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade ujson to version 5.12.0 or higher.
Overview
ujson is an Ultra fast JSON encoder and decoder for Python
Affected versions of this package are vulnerable to Missing Release of Memory after Effective Lifetime in the ujson.load(), ujson.loads(), or ujson.decode() functions when parsing large integers outside the range [-2^63, 2^64 - 1]. An attacker can cause excessive memory consumption leading to denial of service by submitting specially crafted JSON payloads containing such large integers.