CVE-2022-31117— Double free of buffer during string decoding in ujson
Quick assessment
Affected
ultrajson ultrajson
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
UltraJSON是开源的一个超快的 JSON 编码器和解码器，用纯 C 语言编写，并绑定了 Python 3.7+。 UltraJSON 5.4.0之前版本存在资源管理错误漏洞，该漏洞源于为字符串解码重新分配缓冲区时发生错误，可能导致缓冲区被释放两次。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2022-31117
Vulnerability Information
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Vulnerability Title
Double free of buffer during string decoding in ujson
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5
Vulnerability Title
UltraJSON 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
UltraJSON是开源的一个超快的 JSON 编码器和解码器，用纯 C 语言编写，并绑定了 Python 3.7+。 UltraJSON 5.4.0之前版本存在资源管理错误漏洞，该漏洞源于为字符串解码重新分配缓冲区时发生错误，可能导致缓冲区被释放两次。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2022-31117
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2022-31117 (1)
Vendor Advisories for CVE-2022-31117 (1)
-
https://github.com/ultrajson/ultrajson/security/advisories/GHSA-fm67-cv37-96ff x_refsource_CONFIRM
Mailing List Discussions for CVE-2022-31117 (2)
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUMYA5X66IA7/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5ARXAJYZBD2/ vendor-advisory x_refsource_FEDORA
IV. Related Vulnerabilities
Same product: ultrajson
-
CVE-2026-54911
UltraJSON: Malformed/Truncated UTF-8 Accepted and Silently R -
CVE-2026-44660
UltraJSON: Memory Leak in ujson.dump() on Write Failure -
CVE-2026-32875
UltraJSON has an integer overflow handling large indent lead -
CVE-2026-32874
UltraJSON has a Memory Leak parsing large integers allows Do -
CVE-2022-31116
Incorrect handling of invalid surrogate pair characters in u
Same vendor: ultrajson
-
CVE-2026-54911
UltraJSON: Malformed/Truncated UTF-8 Accepted and Silently R -
CVE-2026-44660
UltraJSON: Memory Leak in ujson.dump() on Write Failure -
CVE-2026-32875
UltraJSON has an integer overflow handling large indent lead -
CVE-2026-32874
UltraJSON has a Memory Leak parsing large integers allows Do -
CVE-2022-31116
Incorrect handling of invalid surrogate pair characters in u
Same weakness: CWE-415
V. Comments for CVE-2022-31117
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