CVE-2026-84381

[CVE catalog]

Severity

High · CVSS 8.1CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

Sep 2, 2026, 6:01:31 PM UTC

Updated

Sep 2, 2026, 7:18:08 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.11% · Oct 25, 2026

A flaw was found in httpcore2, a component used by HTTPX2. When a remote origin uses WebSocket Secure (wss) through a SOCKS5 proxy, httpcore2 fails to initiate Transport Layer Security (TLS) encryption because its upgrade condition only recognizes HTTPS. This vulnerability allows an attacker controlling or observing the proxy path to intercept and read sensitive WebSocket traffic, including authentication details and data frames, as it is transmitted in plaintext. The attacker could also modify the traffic or impersonate the WebSocket server, leading to information disclosure and potential compromise of communication integrity. httpx2: httpcore2: HTTPX2: WebSocket traffic sent in plaintext via SOCKS5 proxy due to TLS failure The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.