`Cookie` HTTP header isn't stripped on cross-origin redirects
urllib3 doesn't treat the Cookie HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a Cookie header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly.
Users must handle redirects themselves instead of relying on urllib3's automatic redirects to achieve safe processing of the Cookie header, thus we decided to strip the header by default in order to further protect users who aren't using the correct approach.
Affected usages
We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:
- Using an affected version of urllib3 (patched in v1.26.17 and v2.0.6)
- Using the
Cookieheader on requests, which is mostly typical for impersonating a browser. - Not disabling HTTP redirects
- Either not using HTTPS or for the origin server to redirect to a malicious origin.
Remediation
- Upgrading to at least urllib3 v1.26.17 or v2.0.6
- Disabling HTTP redirects using
redirects=Falsewhen sending requests. - Not using the
Cookieheader.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | urllib3 | >= 2.0.0, < 2.0.6, < 1.26.17 | 2.0.6, 1.26.17 |
References
- https://github.com/urllib3/urllib3/commit/644124ecd0b6e417c527191f866daa05a5a2056d
- https://github.com/urllib3/urllib3/security/advisories/GHSA-v845-jxx5-vc9f
- https://github.com/urllib3/urllib3/commit/01220354d389cd05474713f8c982d05c9b17aafb
- https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html
- https://nvd.nist.gov/vuln/detail/CVE-2023-43804
- https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2023-192.yaml
- https://github.com/urllib3/urllib3
- https://lists.debian.org/debian-lts-announce/2024/12/msg00020.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5F5CUBAN5XMEBVBZPHFITBLMJV5FIJJ5
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I3PR7C6RJ6JUBQKIJ644DMIJSUP36VDY
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAGZXYJ7H2G3SB47M453VQVNAWKAEJJ
- https://security.netapp.com/advisory/ntap-20241213-0007
- https://www.vicarius.io/vsociety/posts/cve-2023-43804-urllib3-vulnerability-3
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N- Weakness (CWE)
CWE-200- Platform
- Python (PyPI)
- Package
urllib3- Disclosed
- 02.10.2023
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2023-192 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-v845-jxx5-vc9f - CC BY 4.0
Vulnerability history: urllib3
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 22
- First → latest
- 01.2017 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 11
- Medium 10
Disclosures per year
- 2017: 1
- 2018: 1
- 2019: 2
- 2020: 2
- 2021: 2
- 2022: 0
- 2023: 3
- 2024: 1
- 2025: 4
- 2026: 6
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