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BREW-theharvester-CVE-2021-45958 — UltraJSON vulnerable to Out-of-bounds Write

2026-10-02T16:59:30.249133+00:00

Affected: Homebrew: theharvester

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

certfr-2024-avi-0366 — De multiples vulnérabilités ont été découvertes dans les produits IBM. Certaines d'entre el…

2026-10-02T16:59:30.249195+00:00

certfr-2024-avi-0366

EUVD-2026-33652

2026-10-02T16:59:30.249225+00:00

EUVD-2026-33652

fkie_cve-2021-45958

2026-10-02T16:59:30.249245+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

2026-10-02T16:59:30.249283+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).

gsd-2021-45958

2026-10-02T16:59:30.249304+00:00

gsd-2021-45958

OESA-2026-3606 — python-ujson security update

2026-10-02T16:59:30.249316+00:00

Affected: openEuler:20.03-LTS-SP4: python-ujson

UltraJSON Security Fix(es):

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.(CVE-2021-45958)

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 certain characters. JSON strings that contain escaped surrogate characters not part of a proper surrogate pair were decoded incorrectly. Besides corrupting strings, this allowed for potential key confusion and value overwriting in dictionaries. All users parsing JSON from untrusted sources are vulnerable. From version 5.4.0, UltraJSON decodes lone surrogates in the same way as the standard library's `json` module does, preserving them in the parsed output. Users are advised to upgrade. There are no known workarounds for this issue.(CVE-2022-31116)

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 reallocating a buffer for string decoding can cause the buffer to get freed twice. Due to how UltraJSON uses the internal decoder, this double free is impossible to trigger from Python. This issue has been resolved in version 5.4.0 and all users should upgrade to UltraJSON 5.4.0. There are no known workarounds for this issue.(CVE-2022-31117)

UltraJSON is a fast JSON encoder and decoder written in pure C wi…

openSUSE-SU-2024:12106-1 — python310-ujson-5.3.0-1.1 on GA media

2026-10-02T16:59:30.249354+00:00

python310-ujson-5.3.0-1.1 on GA media

PYSEC-2022-25

2026-10-02T16:59:30.249371+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.

UBUNTU-CVE-2021-45958

2026-10-02T16:59:30.249388+00:00

Affected: Ubuntu:14.04:LTS: pandas, Ubuntu:Pro:16.04:LTS: ujson, Ubuntu:16.04:LTS: pandas, Ubuntu:18.04:LTS: pandas, Ubuntu:Pro:18.04:LTS: ujson, Ubuntu:20.04:LTS: ujson, Ubuntu:20.04:LTS: pandas, Ubuntu:22.04:LTS: pandas, Ubuntu:Pro:22.04:LTS: ujson, Ubuntu:24.04:LTS: pandas and 2 more

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.