python-httpx2: HTTPX2 is a next generation HTTP client for Python
CVE-2026-84380 is fixed in python-httpx2 on 1 platform by DEBIAN-CVE-2026-84380 (version 2.12.0-1), released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.
HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, Request._prepare() in src/httpx2/httpx2/_models.py can add a body-derived Content-Length header to a request that already contains a caller-supplied Transfer-Encoding header because its setdefault() processing checks each default header independently rather than treating the two framing headers as mutually exclusive. Fixed-size byte, JSON, form, and known-length multipart bodies can therefore be serialized over HTTP/1.1 with both headers, allowing request smuggling or connection desynchronization when downstream intermediaries disagree about which framing header takes precedence. This issue is fixed in version 2.11.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-httpx2 · Debian 14 | 2.12.0-1 | DEBIAN-CVE-2026-84380 | Sep 8, 2026 |
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