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CVE-2026-44432— urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API

Quick assessment

Affected
urllib3 urllib3
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

urllib3是urllib3开源的一款Python HTTP库。该产品具有线程安全连接池、文件发布支持等。 urllib3 2.6.0版本至2.7.0之前版本存在安全漏洞，该漏洞源于在第二次HTTPResponse.read调用或drain_conn调用时可能解压缩整个响应而非请求部分，导致客户端资源过度消耗。

CVSS 8.9 · High EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
urllib3 urllib3 >= 2.6.0, < 2.7.0 affected
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I. Basic Information for CVE-2026-44432

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API
Source: CVE Program / CVE List V5
Vulnerability Description
urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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
urllib3 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
urllib3是urllib3开源的一款Python HTTP库。该产品具有线程安全连接池、文件发布支持等。 urllib3 2.6.0版本至2.7.0之前版本存在安全漏洞，该漏洞源于在第二次HTTPResponse.read调用或drain_conn调用时可能解压缩整个响应而非请求部分，导致客户端资源过度消耗。
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
urllib3 urllib3 >= 2.6.0, < 2.7.0 -

II. Public POCs for CVE-2026-44432

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9750 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-44432

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Vendor Advisories for CVE-2026-44432 (1)

IV. Related Vulnerabilities

Same product: urllib3
Same vendor: urllib3
Same weakness: CWE-409

V. Comments for CVE-2026-44432

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