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Vulnerability record · CVE-2022-31117 · published 5 July 2022

CVE-2022-31117: Ultrajson project ultrajson double free vulnerability

UUltrajson Project · Ultrajson

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.

5.9 CVSS 3.1 Medium EPSS 1.9% · top 21.4% CWE-415 · Double free
5.9CVSS 3.1 base score, v2 4.3
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/ultrajson/ultrajson/commit/9c20de0f77b391093967e25d01fb48671104b15b PatchThird Party Advisory
https://github.com/ultrajson/ultrajson/security/advisories/GHSA-fm67-cv37-96ff Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5A
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUM
https://github.com/ultrajson/ultrajson/commit/9c20de0f77b391093967e25d01fb48671104b15b PatchThird Party Advisory
https://github.com/ultrajson/ultrajson/security/advisories/GHSA-fm67-cv37-96ff Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5A
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUM

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Source: NIST National Vulnerability Database (record CVE-2022-31117), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.