Bug 2482406 (CVE-2026-44660) - CVE-2026-44660 python-ujson: UltraJSON: Memory leak leading to Denial of Service
Summary: CVE-2026-44660 python-ujson: UltraJSON: Memory leak leading to Denial of Service
Keywords:
Status: NEW
Alias: CVE-2026-44660
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2486951 2486952 2486949 2486950
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-27 21:02 UTC by OSIDB Bzimport
Modified: 2026-06-09 10:14 UTC (History)
31 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-05-27 21:02:09 UTC 
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.
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