Detections
Analytics

Echo: tornado: security update to 6.5.6

high Tenable Cloud Security Plugin ID 457216

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 6.5.6, Tornado gzip
 decompression routines processed limited-size chunks but did not enforce an overall limit on accumulated
 decompressed chunks, allowing a malicious server accessed by SimpleAsyncHTTPClient or an HTTPServer
 configured with decompress_request=True to consume effectively unlimited memory. This issue is fixed in
 version 6.5.6. (CVE-2026-49855)

Solution

Update the tornado library and its related packages to version 6.5.6 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-49855

Plugin Details

Severity: High

ID: 457216

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.76

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-2026-49855

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-2026-49855

IAVB: 2026-B-0166-S