CVE-2026-86413

EUVD-2026-105279
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
curlCNA
UNKNOWN
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 22.71%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
curlcurl
𝑥
≤ 8.22.0
CNA
curlcurl
𝑥
≤ 8.21.0
CNA
Debian logo
Debian Releases
Debian Product
Codename
curl
bookworm
7.88.1-10+deb12u15
fixed
bookworm (security)
7.88.1-10+deb12u5
fixed
forky
vulnerable
sid
8.23.0-1
fixed
trixie
8.14.1-2+deb13u5
fixed
trixie (security)
8.14.1-2+deb13u7
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
curl
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
resolute
not-affected
trusty
not-affected
xenial
not-affected
Vulnerability Media Exposure
References
https://curl.se/docs/CVE-2026-86413.html
https://curl.se/docs/CVE-2026-86413.json
https://hackerone.com/reports/3993549