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CVE-2022-31116— Incorrect handling of invalid surrogate pair characters 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之前版本存在安全漏洞，该漏洞源于无法正确解码某些字符，允许字典中潜在的键混淆和值覆盖。

CVSS 7.5 · High EPSS 2.47% · P84

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2022-31116

Vulnerability Information
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Vulnerability Title
Incorrect handling of invalid surrogate pair characters 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+. 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
控制流实现总是不正确
Source: CVE Program / CVE List V5
Vulnerability Title
UltraJSON 安全漏洞
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之前版本存在安全漏洞，该漏洞源于无法正确解码某些字符，允许字典中潜在的键混淆和值覆盖。
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

Vendor Product Affected Versions CPE Subscribe
ultrajson ultrajson < 5.4.0 -

II. Public POCs for CVE-2022-31116

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III. Intelligence Information for CVE-2022-31116

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Patches & Fixes for CVE-2022-31116 (1)

Vendor Advisories for CVE-2022-31116 (1)

Mailing List Discussions for CVE-2022-31116 (2)

IV. Related Vulnerabilities

Same product: ultrajson
Same vendor: ultrajson
Same weakness: CWE-670

V. Comments for CVE-2022-31116

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