CVE-2026-54911
2 advisories.
PyPI/ujson CVE-2026-54911: medium 6.5, EPSS 0.37%
UltraJSON: Malformed/Truncated UTF-8 Accepted and Silently Rewritten in ujson.dumps()
Action: Upgrade ujson to 5.13.0 or later.
pip install ujson==5.13.0Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 5.13.0 | - |
Fixed versions
| 5.13.0 |
Sources
- osv: GHSA-3j69-69wj-xqx2
- https://github.com/ultrajson/ultrajson/security/advisories/GHSA-3j69-69wj-xqx2
- https://nvd.nist.gov/vuln/detail/CVE-2026-54911
- https://github.com/ultrajson/ultrajson/commit/169eaf36b1116fece5034ee79a7a0ef3f6deedcf
- https://github.com/pypa/advisory-database/tree/main/vulns/ujson/PYSEC-2026-2294.yaml
- https://github.com/ultrajson/ultrajson
- https://github.com/ultrajson/ultrajson/releases/tag/5.13.0
CVE-2026-54911 · published · modified · JSON
PyPI/ujson CVE-2026-54911: medium 6.5, EPSS 0.37%
UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Prior to 5.13.0, ujson.dumps() (or ujson.dump() or ujson.encode()) have a reject_bytes=False option. When
Action: Upgrade ujson to 5.13.0 or later.
pip install ujson==5.13.0Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 5.13.0 | - |
Fixed versions
| 5.13.0 |
Sources
- osv: PYSEC-2026-2294
- https://github.com/ultrajson/ultrajson/releases/tag/5.13.0
- https://github.com/ultrajson/ultrajson/commit/169eaf36b1116fece5034ee79a7a0ef3f6deedcf
- https://github.com/ultrajson/ultrajson/security/advisories/GHSA-3j69-69wj-xqx2
CVE-2026-54911 · published · modified · JSON