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Chainguard: synapse: security update to 1.164.1-r2

medium Tenable Cloud Security Plugin ID 478044

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.web.http.HTTPChannel.headerReceived rejects a NUL byte in an HTTP header value but
 accepts a bare carriage return or bare line feed. Because Twisted splits header lines only on CRLF, a
 hidden Content-Length header can remain folded into another value while a lenient front end treats the
 bare character as a line terminator. The resulting framing disagreement can smuggle a following request
 past front-end access controls, poison a shared connection or cache, and expose a later client to the
 wrong response. This issue is an incomplete-fix residual of earlier Twisted request-smuggling protections.
 This issue is fixed in version 26.10.0rc1. (CVE-2026-115877)

Solution

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

Plugin Details

Severity: Medium

ID: 478044

Version: Revision 1.1

Type: Local

Published: 10/31/2026

Updated: 10/31/2026

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 10.32

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2026-115877

CVSS v3

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.7

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

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-2026-115877