CVE-2022-31116

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.

• CWE-670

• https://github.com/ultrajson/ultrajson/commit/67ec07183342589d602e0fcf7bb1ff3e19272687Patch, Third Party Advisory
• https://github.com/ultrajson/ultrajson/security/advisories/GHSA-wpqr-jcpx-745rExploit, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5ARXAJYZBD2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUMYA5X66IA7/
• https://github.com/ultrajson/ultrajson/commit/67ec07183342589d602e0fcf7bb1ff3e19272687Patch, Third Party Advisory
• https://github.com/ultrajson/ultrajson/security/advisories/GHSA-wpqr-jcpx-745rExploit, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5ARXAJYZBD2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUMYA5X66IA7/

Published

Jul 5, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2022-31110RSSHub is an open source, extensible RSS feed generator. In …7.5
• CVE-2022-31111Frontier is Substrate's Ethereum compatibility layer. In aff…5.3
• CVE-2022-31112Parse Server is an open source backend that can be deployed …8.2
• CVE-2022-31113Canarytokens is an open source tool which helps track activi…6.1
• CVE-2022-31114backpack/crud provides Create, Read, Update & Delete (CRUD) …5.1
• CVE-2022-31115opensearch-ruby is a community-driven, open source fork of e…8.8
• CVE-2022-31117UltraJSON is a fast JSON encoder and decoder written in pure…5.9
• CVE-2022-31118Nextcloud server is an open source personal cloud solution. …5.3
• CVE-2022-31119Nextcloud Mail is an email application for the nextcloud per…4.9
• CVE-2022-3112An issue was discovered in the Linux kernel through 5.16-rc6…5.5
• CVE-2022-31120Nextcloud server is an open source personal cloud solution. …2.7
• CVE-2022-31121Hyperledger Fabric is a permissioned distributed ledger fram…7.5