HTTPX2: Secure WebSocket traffic sent without TLS through SOCKS proxies

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-84381
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-02 19:18:08 UTC
Updated2026-09-02 19:18:08 UTC
DescriptionHTTPX2 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

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

Problem Types: CWE-319 | CWE-319 CWE-319: Cleartext Transmission of Sensitive Information

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pydantic Httpx2 affected >= 2.6.0, < 2.10.0 Not specified
CNA Pydantic Httpcore2 affected < 2.10.0 Not specified

References

ReferenceSourceLinkTags
github.com/pydantic/httpx2/commit/fb008dd700b761d955210d9692475c3e2f379453 [email protected] github.com
github.com/pydantic/httpx2/pull/1104 [email protected] github.com
github.com/pydantic/httpx2/releases/tag/v2.10.0 [email protected] github.com
github.com/pydantic/httpx2/security/advisories/GHSA-7mj9-2mp8-4m2p [email protected] github.com
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