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

Quick assessment

Affected
pydantic httpx2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HTTPX2 是一款面向 Python 的下一代 HTTP 客户端。在 2.12.0 版本之前，HTTPX2 的内容解码器（位于 ）会在通过 或 向应用程序输出有界数据块之前，先将每个 gzip、deflate、br 或 zstd 网络数据块完整地解压/扩展。一个 64 KiB 的压缩数据块可能在单次中间内存分配中扩展为约 64 MiB，因此攻击者可控或被攻破的服务器即使应用程序是以流式方式读取响应，也可能导致严重的内存压力，甚至引发进程因内存不足（OOM）而终止。该问题已在 2.12.0 版本中修复。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
pydantic httpx2 < 2.12.0 affected
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I. Basic Information for CVE-2026-84382

Vulnerability Information
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Vulnerability Title
HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pydantic httpx2 < 2.12.0 -

II. Public POCs for CVE-2026-84382

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III. Intelligence Information for CVE-2026-84382

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Patches & Fixes for CVE-2026-84382 (2)

Vendor Advisories for CVE-2026-84382 (1)

Vendor Pages for CVE-2026-84382 (1)

Same Patch Batch · pydantic · 2026-09-02 · 5 CVEs total

CVE-2026-84381 8.1 HIGH HTTPX2: Secure WebSocket traffic sent without TLS through SOCKS proxies
CVE-2026-84378 5.9 MEDIUM HTTPX2: Quadratic SSE line buffering can cause CPU denial of service
CVE-2026-84380 5.6 MEDIUM HTTPX2: Conflicting Content-Length and Transfer-Encoding headers can be auto-generated
CVE-2026-84379 5.3 MEDIUM HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom heade

IV. Related Vulnerabilities

Same product: httpx2
Same vendor: pydantic
Same weakness: CWE-409

V. Comments for CVE-2026-84382

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