CVE-2018-25091
This can allow for credentials in the authorization header to be exposed to unintended hosts or transmitted in cleartext.
Does this matter?
Lower severity and a low EPSS score (0.59%). Track it; it rarely justifies an emergency change on its own.
Description
urllib3 before 1.24.2 does not remove the authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the authorization header to be exposed to unintended hosts or transmitted in cleartext. NOTE: this issue exists because of an incomplete fix for CVE-2018-20060 (which was case-sensitive).
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.59% probability · 48th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-601
- Affected
- python/urllib3
- Source
- cve@mitre.org
EPSS 0.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/urllib3/urllib3/commit/adb358f8e06865406d1f05e581a16cbea2136fbcPatch
- https://github.com/urllib3/urllib3/compare/1.24.1...1.24.2Patch
- https://github.com/urllib3/urllib3/issues/1510Issue Tracking, Patch, Vendor Advisory
- https://github.com/urllib3/urllib3/commit/adb358f8e06865406d1f05e581a16cbea2136fbcPatch
- https://github.com/urllib3/urllib3/compare/1.24.1...1.24.2Patch
- https://github.com/urllib3/urllib3/issues/1510Issue Tracking, Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.