Memory Leak Affecting ujson package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN11-UJSON-17099487
- published30 May 2026
- disclosed27 May 2026
Introduced: 27 May 2026
NewCVE-2026-44660 (opens in a new tab)How to fix?
There is no fixed version for Debian:11 ujson.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ujson package and not the ujson package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
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.