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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.

Pydantic HTTPX2是Pydantic组织的一个支持HTTP/2协议的异步HTTP客户端库。 Pydantic HTTPX2 2.12.0之前版本存在资源管理错误漏洞，该漏洞源于src/httpx2/httpx2/_decoders.py中的内容解码器在应用流式处理前对gzip、deflate、br或zstd网络块进行完全解压，可能导致内存严重压力或进程因内存耗尽而终止。

CVSS 7.5 · High EPSS 0.63% · P49

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
Vulnerability Title
Pydantic HTTPX2 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pydantic HTTPX2是Pydantic组织的一个支持HTTP/2协议的异步HTTP客户端库。 Pydantic HTTPX2 2.12.0之前版本存在资源管理错误漏洞，该漏洞源于src/httpx2/httpx2/_decoders.py中的内容解码器在应用流式处理前对gzip、deflate、br或zstd网络块进行完全解压，可能导致内存严重压力或进程因内存耗尽而终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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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