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CVE-2021-45958

2026-09-29T15:58:18.551204+00:00

UltraJSON (aka ujson) through 5.1.0 has a stack-based buffer overflow in Buffer_AppendIndentUnchecked (called from encode). Exploitation can, for example, use a large amount of indentation.

GHSA-fh56-85cw-5pq6 — UltraJSON vulnerable to Out-of-bounds Write

2026-09-29T15:58:18.551384+00:00

Affected: PyPI: ujson

UltraJSON (aka ujson) 1.34 through 5.1.0 has a stack-based buffer overflow in Buffer_AppendIndentUnchecked (called from encode).

PYSEC-2022-25

2026-09-29T15:58:18.551420+00:00

Affected: PyPI: ujson

UltraJSON (aka ujson) through 5.1.0 has a stack-based buffer overflow in Buffer_AppendIndentUnchecked (called from encode). Exploitation can, for example, use a large amount of indentation.