SB20260423132 - Unsafe reflection in scrapy

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Main Vulnerability Database SB20260423132

SB20260423132 - Unsafe reflection in scrapy

Published: April 23, 2026

Security Bulletin ID SB20260423132
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Unsafe reflection (CVE-ID: N/A)

CWE-ID: CWE-470 - Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to use of externally-controlled input to select classes or code in RefererMiddleware when processing a Referrer-Policy response header. A remote attacker can supply a crafted header value that imports and calls an arbitrary Python object to cause a denial of service.

The issue can be triggered by a malicious site through a response header on follow-up requests.


Remediation

Install update from vendor's website.

References