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SCA: security update for matrix-synapse (GHSA-fh66-fcv5-jjfr)

medium Tenable Self-Hosted Container Security Plugin ID 435539

Description

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

 - Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse
 before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade
 federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is
 patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix
 the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers
 of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.
 (CVE-2025-61672)

See Also

https://github.com/advisories/GHSA-fh66-fcv5-jjfr

Plugin Details

Severity: Medium

ID: 435539

Version: Revision 1.9

Type: Local

Family: SCA Checks

Published: 10/8/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.2

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2025-61672

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

CVSS v4

Risk Factor: Medium

Base Score: 5.3

Threat Score: 1.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/8/2025

Vulnerability Publication Date: 10/8/2025

Reference Information

CVE: CVE-2025-61672