Unsafe reflection in scrapy - #VU127080
Published: April 23, 2026
Vulnerability identifier: #VU127080
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: N/A
CWE-ID: CWE-470
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: scrapy.org
Affected software:
scrapy
scrapy
Detailed vulnerability description
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 security update from vendor's website.