Detections
Analytics

Chainguard: synapse: security update to 1.164.1-r2

high Tenable Cloud Security Plugin ID 478041

Description

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

 - Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to
 26.10.0rc1, twisted.conch.telnet.Telnet.dataReceived appends every byte received after IAC SB to a
 persistent subnegotiation buffer until IAC SE is received, without applying a maximum length. Telnet
 option negotiation occurs before authentication, so an unauthenticated peer can omit the terminator and
 continuously grow the buffer. The resulting memory exhaustion can terminate the process and every service
 it hosts. This issue is fixed in version 26.10.0rc1. (CVE-2026-115778)

Solution

Update the synapse library and its related packages to version 1.164.1-r2 or later.

Plugin Details

Severity: High

ID: 478041

Version: Revision 1.1

Type: Local

Published: 10/31/2026

Updated: 10/31/2026

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-2026-115778

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

Vulnerability Publication Date: 10/23/2026

Reference Information

CVE: CVE-2026-115778