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Affected Component
Analysis
python3-ujson
Patched
Name
CVE-2026-54911
Description
UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Prior to 5.13.0, ujson.dumps() (or ujson.dump() or ujson.encode()) have a reject_bytes=False option. When set, they may accept malformed or truncated UTF-8 byte sequences, silently rewriting them into different Unicode characters instead of rejecting them. This leads to input validation bypass and data integrity issues. This vulnerability is fixed in 5.13.0.
CWEs
Published Date
Updated Date
Workaround
-
Analysis#
Vulnerability Ratings#
6.5
CVSSv31
NaN
other
Others affected component#
Name
Project
Project Version
Version
Status
yocto
kirkstone
5.1.0
Not Affected
Resolved with patches#
python3-ujson (yocto:scarthgap)
#
Title
Author
Resolve
1
More UTF-8 validation for ujson.dumps(b"...",
=?UTF-8?q?Br=C3=A9nainn=20Woodsend?= <bwoodsend@gmail.com>
CVE-2026-54911