vulnerability / NVI-00012211 / Revision 4
Scrapy: Arbitrary Module Import via Referrer-Policy Header in RefererMiddleware
GitHub lists this reviewed advisory for Scrapy. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
7.5 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
7.5 HIGH (3.1)
security-advisories@github.com severity; no combined Null risk score.
0.378%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.31869. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
Scrapy
source listed>= 1.4.0, <= 2.14.1
### Impact Since version 1.4.0, Scrapy respects the `Referrer-Policy` response header to decide whether and how to set a `Referer` header on follow-up requests. If the header value looked like a valid Python import path, Scrapy would import the referenced object and call it, assuming it referred to a referrer policy class (for example, `scrapy.spidermiddlewares.referer.DefaultReferrerPolicy`) and attempting to instantiate it to handle the `Referer` header. A malicious site could exploit this by setting `Referrer-Policy` to a path such as `sys.exit`, causing Scrapy to import and execute it and potentially terminate the process. ### Patches Upgrade to Scrapy 2.14.2 (or later). ### Workarounds If you cannot upgrade to Scrapy 2.14.2, consider the following mitigations. - **Disable the middleware:** If you don't need the `Referer` header on follow-up requests, set `REFERER_ENABLED` to `False`. - **Set headers manually:** If you do need a `Referer`, disable the middleware and set the header explicitly on the requests that require it. - **Set `referrer_policy` in request metadata:** If disabling the
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
- NVD lastModified does not establish freshness of every associated CPE record.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-cwxj-rr6w-m6w7 ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
- CVE-2026-105782 ↗
NIST National Vulnerability Database · official catalog
Observed . This product uses data from the NVD API but is not endorsed or certified by the NVD.
- CVE-2026-105782 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 4 ·
Source facts changed; compare the preserved prior revision.
- Revision 3 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.