PoC Index85,092 CVEs with PoCs

CVE-2023-43804

`Cookie` HTTP header isn't stripped on cross-origin redirects

HIGH 7.4EPSS 1.4%

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.

Affected
urllib3
CVSS v4.0 GitHub
7.4 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS v3.1 NVD
8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v3.1 GITHUB
5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
EPSS
1.36% chance of exploitation in the next 30 days, 71st percentile
Published
2023-10-04
Updated
2025-11-03

Proof-of-concept exploits (1)

Security advisories

References