Generated remediation guidance and an executive summary. No account required.
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.
Cite this page
CVE-2022-31117. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2022-31117
Use CWE-415, Ultrajson Project vendor hub and Ultrajson product page to widen CVE-2022-31117 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-32875, CVE-2026-32874 and CVE-2022-31116 for nearby disclosures in the same product family.