ujson: UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+
CVE-2026-44660 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-44660, released May 27, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-ujson · opensuse-leap 16.0 | 5.10.0-160000.3.1 | OPENSUSE-SU-2026:21518-1 | Aug 3, 2026 |
| python-ujson · sles 15.6 | 1.35-150100.3.13.1 | SUSE-SU-2026:3539-1 | Aug 10, 2026 |
| python-ujson · sles 15.7 | 1.35-150100.3.13.1 | SUSE-SU-2026:3539-1 | Aug 10, 2026 |
| python-ujson · sles 16.0 | 5.10.0-160000.3.1 | SUSE-SU-2026:23136-1 | Aug 3, 2026 |
| ujson · Debian 14 | 5.13.0-1 | DEBIAN-CVE-2026-44660 | May 27, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.