CVE-2022-31117 Double free of buffer during string decoding in ujson

What is CVE-2022-31117?

CVE-2022-31117 is a medium-severity use after free vulnerability in Fedoraproject Fedora, published on 5 Jul 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-415

Which versions are affected by CVE-2022-31117?

3 open source packages ship an affected version, including ujson. It affects 2 products.

Products include Fedoraproject Fedora, Ultrajson Project Ultrajson.

How do I fix CVE-2022-31117?

Upgrade ujson to 5.4.0 or later.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2022-31117 being exploited?

There is no known exploitation of CVE-2022-31117 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2022-31117, GHSA-fm67-cv37-96ff, PYSEC-2026-1056, UBUNTU-CVE-2022-31117.