CVE-2026-87861

EUVD-2026-105308
When using ambient user credentials, an HTTP request directed to one origin
may be dispatched over a connection previously authenticated via Negotiate for
a different origin, leaving the request's intended credentials unused.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
curlCNA
UNKNOWN
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 20.44%
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-2026-87861.html
https://curl.se/docs/CVE-2026-87861.json
https://hackerone.com/reports/3972094