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CVE-2026-84366— Scrapy: S3DownloadHandler sends signed S3 requests over plaintext HTTP by default

Quick assessment

Affected
scrapy scrapy
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.

Scrapy 是一个用于 Python 的高级网络爬虫和网页抓取框架。在 2.17.0 版本之前，在 中，Scrapy 的 会将 S3 协议（s3-scheme）的桶（bucket）和键（key）请求转换为发往对应 S3 端点的明文 HTTP 请求，除非显式启用了 。此时，它使用配置好的 AWS 凭证对该明文请求进行签名并发送。 任何能够观察 Scrapy 与 S3 之间流量传输路径的网络攻击者都可以读取桶和键的路径、AWS Authorization 请求头、使用临时凭证时的 、S3 对象内容以及 S3 响应头。

CVSS 7.4 · High EPSS 0.16% · P5

Affected Version Matrix 1

VendorProduct Version RangeStatus
scrapy scrapy < 2.17.0 affected
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I. Basic Information for CVE-2026-84366

Vulnerability Information
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Vulnerability Title
Scrapy: S3DownloadHandler sends signed S3 requests over plaintext HTTP by default
Source: CVE Program / CVE List V5
Vulnerability Description
Scrapy is a high-level web crawling and scraping framework for Python. Prior to 2.17.0, in scrapy/core/downloader/handlers/s3.py, Scrapy's S3DownloadHandler converts an S3-scheme bucket and key request into a plaintext HTTP request to the corresponding S3 endpoint unless request.meta["is_secure"] is explicitly enabled, then signs and sends the plaintext request with configured AWS credentials. A network attacker who can observe traffic between Scrapy and S3 can read the bucket and key path, AWS Authorization header, X-Amz-Security-Token when temporary credentials are used, S3 object contents, and S3 response headers. An active man-in-the-middle attacker can also modify the plaintext S3 response body, status code, and headers before Scrapy processes them, causing scraped-data poisoning, poisoned exports, HTTP cache poisoning when caching is enabled, or influence over later crawl targets through forged redirects or attacker-controlled links. Users making S3-scheme requests with AWS credentials are affected. This issue is fixed in version 2.17.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文传输
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
scrapy scrapy < 2.17.0 -

II. Public POCs for CVE-2026-84366

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III. Intelligence Information for CVE-2026-84366

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Patches & Fixes for CVE-2026-84366 (1)

Vendor Advisories for CVE-2026-84366 (1)

Vendor Pages for CVE-2026-84366 (1)

IV. Related Vulnerabilities

Same product: scrapy
Same vendor: scrapy
Same weakness: CWE-319

V. Comments for CVE-2026-84366

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