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Echo: tornado: security update to 6.5.8

high Tenable Self-Hosted Container Security Plugin ID 455299

Description

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

 - Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses
 application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py without
 passing max_num_fields. RequestHandler._execute in tornado/web.py parses the body before handler dispatch
 through HTTPServerRequest._parse_body and parse_body_arguments in tornado/httputil.py, so an
 unauthenticated request body containing millions of separator-delimited fields can synchronously stall the
 single-threaded event loop and delay every connection. The body is bounded only by max_buffer_size, which
 defaults to 104857600 bytes. This issue is fixed in version 6.5.8. (CVE-2026-82397)

Solution

Update the tornado library and its related packages to version 6.5.8 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-82397

Plugin Details

Severity: High

ID: 455299

Version: Revision 1.1

Type: Local

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.62

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-2026-82397

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: 9/3/2026

Vulnerability Publication Date: 8/31/2026

Reference Information

CVE: CVE-2026-82397

IAVB: 2026-B-0248