HTTPX2 is a next generation HTTP client for Python

Overview

HTTPX2 is a next generation HTTP client for Python. Prior to 2.10.0, httpcore2 fails to start TLS in src/httpcore2/httpcore2/_sync/socks_proxy.py and src/httpcore2/httpcore2/_async/socks_proxy.py when the remote origin uses wss through a SOCKS5 proxy because the TLS upgrade condition only recognizes https. HTTPX2 exposes the flaw through Client.websocket() and AsyncClient.websocket() from 2.6.0 through 2.9.1, so the opening handshake, query parameters, Authorization headers, cookies, and subsequent frames can cross the proxy path in plaintext without certificate verification. An attacker controlling or observing that path can read or modify traffic and impersonate the WebSocket server. This issue is fixed in httpcore2 2.10.0 and HTTPX2 2.10.0.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Package advisory (CVE-2026-84381)

Affected packages:

• httpcore2 < 2.10.0
• httpx2 >= 2.6.0, < 2.10.0

Patched in:

• httpcore2 2.10.0
• httpx2 2.10.0

Source: https://github.com/advisories/GHSA-7mj9-2mp8-4m2p

Vendor advisories

• Red Hat VEX · Important · affected: Lightspeed Core, Red Hat OpenShift AI (RHOAI) · no fix planned: Lightspeed Core, Red Hat OpenShift AI (RHOAI) · updated 2026-10-14 · vex
• RHSA-2026:82061 · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · advisory
• RHSA-2026:82371 · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · advisory