High 8.1Published Sep 2, 2026

CVE-2026-84381HTTPX2: Secure WebSocket traffic sent without TLS through SOCKS proxies

Updated under an hour ago (2026-10-19 06:20 UTC)

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It affects pydantic httpx2 and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for pydantic httpx2

Exploited in the last 30 days

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: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-319
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Sep 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

pydantic httpx2 pydantic:httpx2 (from the name)	from 2.6.0, < 2.10.0	CNA record
pydantic httpcore2 pydantic:httpcore2 (from the name)	before 2.10.0	CNA record

References

https://github.com/pydantic/httpx2/security/advisories/GHSA-7mj9-2mp8-4m2px-refsource-confirm
https://github.com/pydantic/httpx2/pull/1104x-refsource-misc
https://github.com/pydantic/httpx2/commit/fb008dd700b761d955210d9692475c3e2f379453x-refsource-misc
https://github.com/pydantic/httpx2/releases/tag/v2.10.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.