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Echo: python-multipart: security update to 0.0.30

high Tenable Cloud Security Plugin ID 459324

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, when parsing
 application/x-www-form-urlencoded bodies, QuerystringParser located the field separator with a two step
 lookup: it first scanned the entire remaining buffer for &, and only when no & existed anywhere ahead did
 it fall back to scanning for ;. For a body that uses ; as the separator and contains no &, every field
 iteration performed a full failed & scan over the entire remaining buffer before locating the nearby ;.
 With N semicolon separated fields in a chunk of size B, this yields O(B^2) byte comparisons per chunk. An
 attacker can submit a small crafted body of the form a;a;a;... and cause the parser to spend seconds of
 CPU per request. A handful of concurrent requests can exhaust worker processes. This vulnerability is
 fixed in 0.0.30. (CVE-2026-53539)

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-2026-53539

Plugin Details

Severity: High

ID: 459324

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: 3

Percentile: 23.73

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-53539

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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-2026-53539