Detections
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Chainguard: synapse: security update to 1.164.1-r2

medium Tenable Self-Hosted Container Security Plugin ID 478037

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+. In 25.5.0 and
 earlier, wildcardToRegexp() in twisted/mail/imap4.py translates the IMAP asterisk and percent wildcards
 but passes all other characters from an authenticated client's LIST or LSUB pattern directly to
 re.compile(), allowing nested or otherwise expensive regular expression constructs to cause catastrophic
 backtracking when matched against mailbox names. Because Twisted uses a cooperative single-threaded
 reactor, the blocking match suspends all server input and output for the duration of the match. No fixed
 release is available as of this review. (CVE-2026-106454)

Solution

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

Plugin Details

Severity: Medium

ID: 478037

Version: Revision 1.1

Type: Local

Published: 10/31/2026

Updated: 10/31/2026

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2026-106454

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 10/6/2026

Reference Information

CVE: CVE-2026-106454