CVE-2026-63096: dendrite 0 through 0.13.8

CVE-2026-63096. CVSS 3.1 base score 5.8 (MEDIUM, Vendor/CNA). EPSS 0.00335 (percentile 0.25767), scored 24-Oct-2026.

Affected technology

dendrite · 0 through 0.13.8
matrix-org

Description’s affected range: through 0.13.8

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Unauthenticated attackers can cause the server to open outbound TLS connections to arbitrary hosts and ports by supplying an unvalidated serverName parameter to the legacy media download endpoint. Vendor/CNA’s CVSS 4.0 assessment (base score 6.9/10) rates confidentiality, integrity and availability impact as none.

Published 25-Oct-2026 01:30 UTC

CWE: CWE-918
CCR priority: 23.3 /100 (P4)
CVSS 3.1: 5.8 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N · Vendor/CNA
EPSS: 0.00335 · percentile 0.25767 · 2026-10-24
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-25 01:28:19.133527+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-63096.html