CVE-2023-43804`Cookie` HTTP header isn't stripped on cross-origin redirects
- 5.9MediumCVSS base score
- 1.4%Exploitation in 30 daysEPSS · top 28% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
urllib3 is a user-friendly HTTP client library for Python. 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. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.
Timeline
ID reserved
By GitHub_M
- 12 days later
· 12 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Modified | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 1.4% · top 28% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- PyPIurllib3GHSA-v845-jxx5-vc9f (opens in a new tab)
References
References10
- https://github.com/urllib3/urllib3/security/advisories/GHSA-v845-jxx5-vc9f (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/urllib3/urllib3/commit/01220354d389cd05474713f8c982d05c9b17aafb (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/urllib3/urllib3/commit/644124ecd0b6e417c527191f866daa05a5a2056d (opens in a new tab)x_refsource_MISCx_transferred
- https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html (opens in a new tab)x_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/I3PR7C6RJ6JUBQKIJ644DMIJSUP36VDY/ (opens in a new tab)x_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAGZXYJ7H2G3SB47M453VQVNAWKAEJJ/ (opens in a new tab)x_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/5F5CUBAN5XMEBVBZPHFITBLMJV5FIJJ5/ (opens in a new tab)x_transferred
- https://www.vicarius.io/vsociety/posts/cve-2023-43804-urllib3-vulnerability-3 (opens in a new tab)
- https://security.netapp.com/advisory/ntap-20241213-0007/ (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2024/12/msg00020.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2023-0252 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-v845-jxx5-vc9f (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-43804)Record last updated .