Bug 2546224 (CVE-2026-105782)

Summary: CVE-2026-105782 scrapy: Scrapy: Denial of Service via crafted Referrer-Policy header
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Scrapy. A remote attacker controlling a malicious website can cause a Denial of Service (DoS) by providing a specially crafted Referrer-Policy HTTP response header. When processing the response, the RefererMiddleware treats the header value as a Python import path and executes the referenced object, enabling the attacker to terminate the crawling process.
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Bug Depends On: 2546289    
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Description OSIDB Bzimport 2026-10-05 23:31:30 UTC 
Scrapy is a high-level web crawling and scraping framework for Python. From 1.4.0 until 2.14.2, RefererMiddleware in scrapy/spidermiddlewares/referer.py treated a Referrer-Policy response-header value that resembled a Python import path as a referrer policy class, imported the referenced object, and called it. A malicious website could supply a callable such as sys.exit and terminate a crawler processing the response. This issue is fixed in version 2.14.2.