Vulnerability details
CVE-2026-84381
HTTPX2: Secure WebSocket traffic sent without TLS through SOCKS proxies
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| pydantic | httpcore2 | < 2.10.0 | CVEProject cvelistV5 (CNA) |
| pydantic | httpx2 | >= 2.6.0, < 2.10.0 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://github.com/pydantic/httpx2/security/advisories/GHSA-7mj9-2mp8-4m2p x_refsource_CONFIRM
- https://github.com/pydantic/httpx2/pull/1104 x_refsource_MISC
- https://github.com/pydantic/httpx2/commit/fb008dd700b761d955210d9692475c3e2f379453 x_refsource_MISC
- https://github.com/pydantic/httpx2/releases/tag/v2.10.0 x_refsource_MISC
Details
- Published
- 2026-09-02
- Last updated
- 2026-09-05
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-319Cleartext Transmission of Sensitive Information