CVE-2026-84381
Publication date 3 September 2026
Last updated 4 September 2026
Ubuntu priority
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| python-httpx2 | 26.04 LTS resolute | Not in release |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release |
Severity score breakdown
CVSS version: CVSS v3.0
Base score
8.1 · High
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-84381
- https://github.com/pydantic/httpx2/security/advisories/GHSA-7mj9-2mp8-4m2p
- https://github.com/pydantic/httpx2/pull/1104
- https://github.com/pydantic/httpx2/commit/fb008dd700b761d955210d9692475c3e2f379453
- https://github.com/pydantic/httpx2/releases/tag/v2.10.0