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Echo: python-multipart: security update to 0.0.30

low Tenable Self-Hosted Container Security Plugin ID 459468

Description

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

 - Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, QuerystringParser treated ;
 as a field separator in application/x-www-form-urlencoded bodies, in addition to &. The WHATWG URL
 standard, modern browsers, and Python's urllib.parse (since the CVE-2021-23336 fix) treat only & as a
 separator. This creates a parser differential: the same bytes are tokenized into different fields than a
 WHATWG compliant intermediary would produce, allowing an attacker to smuggle extra form fields past an
 upstream body inspecting component. This vulnerability is fixed in 0.0.30. (CVE-2026-53538)

Solution

Update the python-multipart library and its related packages to version 0.0.30 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-53538

Plugin Details

Severity: Low

ID: 459468

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 1.9

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

CVSS Score Source: CVE-2026-53538

CVSS v3

Risk Factor: Low

Base Score: 3.7

Temporal Score: 3.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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: 6/15/2026

Reference Information

CVE: CVE-2026-53538