Cleartext Transmission of Sensitive Information Affecting httpcore2 package, versions [,2.10.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-HTTPCORE2-20361640
- published1 Oct 2026
- disclosed8 Sept 2026
- creditmaxisbey
Introduced: 8 Sep 2026
NewCVE-2026-84381 (opens in a new tab)How to fix?
Upgrade httpcore2 to version 2.10.0 or higher.
Overview
httpcore2 is an A minimal low-level HTTP client.
Affected versions of this package are vulnerable to Cleartext Transmission of Sensitive Information in the synchronous and asynchronous SOCKS5 connection implementations, which decide whether to start TLS by testing for the https scheme alone and do not include wss, so a secure WebSocket connection proceeds unencrypted. An attacker in a MitM position on the proxy path can read credentials, authentication tokens, query parameters, and message content, and impersonate the server, by observing or modifying the handshake and frames, which cross the proxy as plaintext. This requires the application to route wss:// connections through a SOCKS5 proxy, so direct connections and connections through other proxy types are unaffected.