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CVE-2026-84382 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/pydantic/httpx2/commit/4fd0c70a3f207c618b145934792f791bccfb39f8	[email protected]
https://github.com/pydantic/httpx2/pull/1126	[email protected]
https://github.com/pydantic/httpx2/releases/tag/v2.12.0	[email protected]
https://github.com/pydantic/httpx2/security/advisories/GHSA-8xx6-hgc6-gc2m	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-409	Improper Handling of Highly Compressed Data (Data Amplification)	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 3, 2026	CVE Modified	CISA-ADP
Sep 2, 2026	New CVE Received	[email protected]