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Fencer Vulns
medium 5.7

CVE-2021-41125 json

HTTP authentication credential leak to target websites in scrapy

published 2021-10-06 5 y ago modified 2026-07-08 4 mo ago also GHSA-jwqp-28gf-p498 , PYSEC-2021-363 , EUVD-2021-0239

cvss
5.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

Scrapy is a high-level web crawling and scraping framework for Python. If you use `HttpAuthMiddleware` (i.e. the `http_user` and `http_pass` spider attributes) for HTTP authentication, all requests will expose your credentials to the request target. This includes requests generated by Scrapy components, such as `robots.txt` requests sent by Scrapy when the `ROBOTSTXT_OBEY` setting is set to `True`, or as requests reached through redirects. Upgrade to Scrapy 2.5.1 and use the new `http_auth_domain` spider attribute to control which domains are allowed to receive the configured HTTP authentication credentials. If you are using Scrapy 1.8 or a lower version, and upgrading to Scrapy 2.5.1 is not an option, you may upgrade to Scrapy 1.8.1 instead. If you cannot upgrade, set your HTTP authentication credentials on a per-request basis, using for example the `w3lib.http.basic_auth_header` function to convert your credentials into a value that you can assign to the `Authorization` header of your request, instead of defining your credentials globally using `HttpAuthMiddleware`.

Patch / fix

  • pypi scrapy 1.8.1, 2.5.1
  • scrapy scrapy 1.8.1, 2.5.1
  • python-scrapy Debian 14, Debian 13, Debian 12 2.5.1-1

debian advisories DEBIAN-CVE-2021-41125

  • python-scrapy Ubuntu Pro 18.04 LTS 1.5.0-1ubuntu0.1~esm1
  • python-scrapy Ubuntu Pro 20.04 LTS 1.7.3-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-41125

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-Scrapy openSUSE Tumbleweed 2.5.1-1.1

opensuse advisories openSUSE-SU-2024:11558-1

  • scrapy Arch Linux 2.5.1-1

arch linux advisories AVG-2447

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-41125 updated cvss 5.7

python-scrapy: information disclosure when using `HttpAuthMiddleware`

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.26% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:P/I:N/A:N
GitHub 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
pypi scrapy
<1.8.1
>=2.0.0, <2.5.1
1.8.1
2.5.1

Affected products

  • scrapy scrapy

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.