CVE-2026-44660: UltraJSON: Memory Leak in ujson.dump() on Write Failure
Affected: ultrajson · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 36% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- ultrajson · ultrajson< 5.12.1
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CoverageNo articles yet
No CyberSIXT article names CVE-2026-44660 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.