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Echo: ujson: security update to 5.13.0

medium Tenable Self-Hosted Container Security Plugin ID 455222

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-54911)

Solution

Update the ujson library and its related packages to version 5.13.0 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-54911

Plugin Details

Severity: Medium

ID: 455222

Version: Revision 1.1

Type: Local

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 7.77

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-54911

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 7/1/2026

Vulnerability Publication Date: 6/19/2026

Reference Information

CVE: CVE-2026-54911