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

Affected: ultrajson

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.

USN-6629-1 — ujson vulnerabilities

Affected: Ubuntu:Pro:16.04:LTS: ujson, Ubuntu:Pro:18.04:LTS: ujson, Ubuntu:Pro:22.04:LTS: ujson

It was discovered that UltraJSON incorrectly handled certain input with a large amount of indentation. An attacker could possibly use this issue to crash the program, resulting in a denial of service. (CVE-2021-45958)

Jake Miller discovered that UltraJSON incorrectly decoded certain characters. An attacker could possibly use this issue to cause key confusion and overwrite values in dictionaries. (CVE-2022-31116)

It was discovered that UltraJSON incorrectly handled an error when reallocating a buffer for string decoding. An attacker could possibly use this issue to corrupt memory. (CVE-2022-31117)

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

USN-6629-1 — ujson vulnerabilities