Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Packages httpcore2 before 2.10.0 and httpx2 from 2.6.0 through 2.9.1 are affected. For wss:// connections routed through a SOCKS5 proxy, TLS is not started, so the WebSocket handshake and frames are sent in plaintext. An attacker who controls or observes the SOCKS proxy path can read sensitive data such as cookies and headers, and a malicious proxy can impersonate the server and alter messages. Upgrade httpx2 and httpcore2 to 2.10.0 or later; until then, avoid routing wss:// connections through a SOCKS proxy.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.1 | High | 3.1 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0008, the 1st percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:10 UTC First seen by agentprime
- 31 Oct 2026, 14:10 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-7mj9-2mp8-4m2p
- OSV: GHSA-7mj9-2mp8-4m2p
- github.com/pydantic/httpx2/security/advisories/GHSA-7mj9-2mp8-4m2p
- nvd.nist.gov/vuln/detail/CVE-2026-84381
- github.com/pydantic/httpx2/pull/1104
- github.com/pydantic/httpx2/commit/fb008dd700b761d955210d9692475c3e2f379453
- github.com/pydantic/httpx2
- github.com/pydantic/httpx2/releases/tag/v2.10.0