EUVD-2026-70250Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Adjacent-network position required to observe proxy traffic; no privileges or complexity once there; full read and write of plaintext session data.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
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4DescriptionCVE.org
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.
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AnalysisAI
HTTPX2's SOCKS5 proxy implementation omits TLS negotiation for WebSocket Secure (wss://) origins, exposing the full WebSocket session - opening handshake, query parameters, Authorization headers, cookies, and message frames - in plaintext to anyone who can observe or control the proxy path. Affected are applications using Client.websocket() or AsyncClient.websocket() in HTTPX2 versions 2.6.0 through 2.9.1 when routing through a SOCKS5 proxy. …
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Vulnerability AssessmentAI
| Exploitation | Three concurrent conditions are required: (1) the application explicitly uses HTTPX2's Client.websocket() or AsyncClient.websocket() API (not generic HTTP requests), (2) the target URL uses the wss:// scheme, and (3) a SOCKS5 proxy is configured in the HTTPX2 client. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, score 8.1) accurately characterises the threat: an attacker must occupy the adjacent network segment on the path between the HTTPX2 client and its SOCKS5 proxy, but once there faces no complexity barrier, requires no credentials, and gains full read and write access to what should have been an encrypted channel. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: HTTPX2 2.10.0 and httpcore2 2.10.0, available at https://github.com/pydantic/httpx2/releases/tag/v2.10.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your software inventory to identify Python applications using HTTPX2 versions 2.6.0 through 2.9.1, especially those deployed with SOCKS5 proxy routing for WebSocket traffic. …
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