CVE-2022-31116 Incorrect handling of invalid surrogate pair characters in ujson

2022-07-0517:35:11

CWE-670

GitHub_M

www.cve.org

cve-2022-31116

ultrajson

json encoder

python 3.7+

surrogate characters

vulnerable

upgrade

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.002

Percentile

52.5%

JSON

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.

CNA Affected

[
  {
    "product": "ultrajson",
    "vendor": "ultrajson",
    "versions": [
      {
        "status": "affected",
        "version": "< 5.4.0"
      }
    ]
  }
]