CVE-2026-84382

CVE-2026-84382 · HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)

This page contains facts from public vulnerability sources. Check the original advisory before updating.

HTTPX2 is a next generation HTTP client for Python. Prior to 2.12.0, the HTTPX2 content decoders in src/httpx2/httpx2/_decoders.py fully inflate each gzip, deflate, br, or zstd network chunk before iter_bytes() or aiter_bytes() yields bounded pieces to the application. A 64 KiB compressed chunk can expand to approximately 64 MiB in one intermediate allocation, so an attacker-controlled or compromised server can cause severe memory pressure or out-of-memory process termination even when the application streams the response. This issue is fixed in version 2.12.0.

CVSS 7.5 · High · EPSS 0.6% · Fix available

Published

2026-09-02T18:03:05.010Z

Updated

2026-09-03T14:31:19.366Z

Stack: system · python

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