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Ultrajson MEDIUM 6.5

CVE-2026-54911

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 ujso…

Fix: 5.13.0+

Fix from $1,600 2026-06-22

Ultrajson HIGH 7.5

CVE-2026-44660

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-lik…

Fix: 5.12.1+

Fix from $1,950 2026-05-27

Ultrajson HIGH 7.5

CVE-2026-32874

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 m…

Fix: 5.12.0+

Fix from $1,950 2026-03-20

Ultrajson HIGH 7.5

CVE-2026-32875

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.10 through 5.11.0 are vulnerable to buffer o…

Fix: 5.12.0+

Fix from $1,950 2026-03-20

Ultrajson HIGH 7.5

CVE-2022-31116

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Affected versions were found to improperly decode certa…

Fix: 5.4.0+

Fix from $1,950 2022-07-05

Ultrajson MEDIUM 5.9

CVE-2022-31117

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. In versions prior to 5.4.0 an error occurring while rea…

Fix: 5.4.0+

Fix from $1,600 2022-07-05

Ultrajson MEDIUM 5.5

CVE-2021-45958

UltraJSON (aka ujson) through 5.1.0 has a stack-based buffer overflow in Buffer_AppendIndentUnchecked (called from encode). Exploitation can, for exa…

Fix: 5.2.0+

Fix from $1,600 2022-01-01