CVE-2026-86413

critical · 9.1

When using an *ambient user* in a first transfer doing Negotiate authentication and asked to follow redirects, curl could pass on its credential details to an unrelated second origin when asked to redirect there.

9.1

CVSS

0.3%

EPSS (exploit prob.)

25th

EPSS percentile

2026-10-20

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE-201

References

https://curl.se/docs/CVE-2026-86413.html
https://curl.se/docs/CVE-2026-86413.json
https://hackerone.com/reports/3993549
https://hackerone.com/reports/3993549

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-86413