CVE-2026-84380

CVE-2026-84380 · HTTPX2: Conflicting Content-Length and Transfer-Encoding headers can be auto-generated

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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.

CVSS 5.6 · Moyenne · EPSS 0,2% · Correctif disponible

Publication

2026-09-02T17:58:55.520Z

Mise à jour

2026-09-02T18:07:36.980Z

Pile logicielle: system · python

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