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TI-2026-57977 Aliases CVE-2026-84366GHSA-76g3-c3x4-crvx

Scrapy: S3DownloadHandler sends signed S3 requests over plaintext HTTP by default

Priority LOW 34CWE-319Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-319.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00254 17th percentileScored 2026-11-07
Fix Fixed scrapy (scrapy): 2.17.0scrapy (PyPI): 2.17

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
scrapyscrapybefore 2.17.02.17.0Patch availableCNA
—scrapy (PyPI)before 2.172.17Patch availableGHSA-76g3-c3x4-crvx
  • scrapy Vendorscrapy Affected before 2.17.0 Fixed in 2.17.0 Patch available CNA
  • scrapy (PyPI) Vendor— Affected before 2.17 Fixed in 2.17 Patch available GHSA-76g3-c3x4-crvx

Remediation

  • Fix · CNA scrapy (scrapy) Fixed in 2.17.0
  • Fix · GHSA-76g3-c3x4-crvx scrapy (PyPI) Fixed in 2.17 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84366
  2. 2026-10-03 Alias added: GHSA-76g3-c3x4-crvx

References

Advisory 1

Other 4

  • TI-2025-05586 Brotli decompression bomb DoS in scrapy/scrapy CVSS 3.0HIGH 7.5
  • TI-2024-03333 Authorization Header Leak During Cross-Domain Redirect in scrapy/scrapy CVSS 3.0HIGH 7.5
  • TI-2024-03331 XML External Entity (XXE) Vulnerability in scrapy/scrapy CVSS 3.0HIGH 7.5
  • TI-2024-01831 Authorization Header Leakage in scrapy/scrapy on Scheme Change Redirects CVSS 3.0HIGH 7.5
  • TI-2026-68383 Arbitrary module import via Referrer-Policy header in Scrapy CVSS 3.1HIGH 7.5
  • TI-2026-40066 Protego: Exponential backtracking ReDoS in robots.txt URL wildcard matching CVSS 4.0HIGH 7.1
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences