PyPI/ujson CVE-2026-32874: high 7.5, EPSS 0.50%
UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.4.0 through 5.11.0 contain an accumulating memory leak in JSON parsing large (outside of the ra
Action: Upgrade ujson to 5.12.0 or later.
pip install ujson==5.12.0Affected
| introduced | fixed | last affected |
|---|---|---|
| 5.4.0 | 5.12.0 | - |
Fixed versions
| 5.12.0 |
Sources
- osv: PYSEC-2026-2291
- https://access.redhat.com/security/cve/CVE-2026-32874
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32874.json
- https://github.com/ultrajson/ultrajson/releases/tag/5.12.0
- https://github.com/ultrajson/ultrajson/security/advisories/GHSA-wgvc-ghv9-3pmm
- https://bugzilla.redhat.com/show_bug.cgi?id=2449411
- https://github.com/ultrajson/ultrajson/commit/4baeb950df780092bd3c89fc702a868e99a3a1d2
CVE-2026-32874 · published · modified · JSON