Vulnerability Database · PyPI · ujson · Version
ujson 1.4.0
1.4.0 is affected by 8 vulnerabilities.
The vulnerabilities that cover this exact version are listed below with the fixed version to move to. The upgrade Vulert recommends: 6.0.0.
Critical 0 High 4 Medium 4 Low 0 Unrated 0
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Released 16 Jun 2011
Licence non-standard
Also known from other sources 8
Newer releases 43
Database updated 23/Oct/2026
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01 Vulnerabilities affecting this version
ujson 1.4.0 vulnerabilities
8 vulnerabilities cover ujson 1.4.0. Open the full list in the database.
| Vulnerability | Severity | Fixed version | Disclosed |
|---|---|---|---|
| CVE-2026-44660: UltraJSON Memory Leak on Write Failure in ujson.dump() | 8.7 high | 5.12.1 | 12 May 2026 |
| CVE-2022-31116: ujson Package - Incorrect Handling of Invalid Surrogate Pair Characters | 7.5 high | 5.4.0 | 06 Jul 2026 |
| CVE-2026-44660: ujson Memory Leak Vulnerability in JSON Serialization | 7.5 high | 5.12.1 | 27 May 2026 |
| CVE-2022-31116: ujson - Incorrect handling of invalid surrogate pair characters | 7.5 high | 5.4.0 | 05 Jul 2022 |
| CVE-2026-54911: ujson Package Input Validation Bypass and Data Integrity Issue | 6.5 medium | 5.13.0 | 22 Jun 2026 |
| CVE-2026-54911: ujson Malformed UTF-8 Handling Vulnerability | 6.5 medium | 5.13.0 | 19 Jun 2026 |
| CVE-2022-31117: ujson - Potential Double Free of Buffer During String Decoding | 5.9 medium | 5.4.0 | 06 Jul 2026 |
| CVE-2022-31117: Potential double free of buffer during string decoding in ujson | 5.9 medium | 5.4.0 | 05 Jul 2022 |
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Questions
About ujson 1.4.0
Is ujson 1.4.0 vulnerable?
Yes. 8 vulnerabilities in the Vulert database cover ujson 1.4.0: 0 critical, 4 high, 4 medium and 0 low. The upgrade Vulert recommends is 6.0.0, and each entry above names the fixed version to move to.
Which version of ujson should I use instead of 1.4.0?
6.0.0 is the version Vulert recommends for this release line. The version table on the package page lists every release with the vulnerabilities recorded against it.
Is 1.4.0 the latest release of ujson?
No. 1.4.0 was published 16 Jun 2011, and newer releases exist. Newer is not automatically safer — the version table on the package page shows what each release carries.
How do I monitor ujson for upcoming vulnerabilities?
Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the ujson version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.