CVE-2022-31117

MEDIUM

UltraJSON <5.4.0 - Memory Corruption

Title source: llm

Description

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.

References (4)

[Patch, Third Party Advisory] https://github.com/ultrajson/ultrajson/commit/9c20de0f77b391093967e25d01fb48671104b15b

View Patch ZIP pw:eip

[Third Party Advisory] https://github.com/ultrajson/ultrajson/security/advisories/GHSA-fm67-cv37-96ff

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5ARXAJYZBD2/

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUMYA5X66IA7/

Scores

CVSS v3 5.9

EPSS 0.0017

EPSS Percentile 38.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

CWE

CWE-415

Status published

Affected Products (4)

ultrajson_project/ultrajson < 5.4.0

fedoraproject/fedora

fedoraproject/fedora

pypi/ujson < 5.4.0PyPI

Timeline

Published Jul 05, 2022

Tracked Since Feb 18, 2026