CVE-2026-94265

Name	CVE-2026-94265
Description	When processing an HTTP redirect to a URL containing userinfo (a `username:password` component), curl might erroneously retain and re-transmit the original host's HTTP Negotiate authentication state. Consequently, a malicious server can trigger a redirect containing arbitrary userinfo to force curl to send a freshly minted Kerberos ticket—generated using the ambient identity of the client process to an untrusted third-party host, effectively bypassing the domain-scoping restrictions normally enforced by the absence of `--location-trusted`.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
curl (PTS)	bookworm	7.88.1-10+deb12u15	fixed
	bookworm (security)	7.88.1-10+deb12u5	fixed
	trixie	8.14.1-2+deb13u5	fixed
	trixie (security)	8.14.1-2+deb13u7	fixed
	forky	8.22.0-1	vulnerable
	sid	8.23.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
curl	source	bookworm	(not affected)
curl	source	trixie	(not affected)
curl	source	(unstable)	8.23.0~rc2-1

Notes

[trixie] - curl <not-affected> (Vulnerable code not present)
[bookworm] - curl <not-affected> (Vulnerable code not present)
https://curl.se/docs/CVE-2026-94265.html
Introduced with: https://github.com/curl/curl/commit/8f71d0fde515aa4c68002477356c35bd79927729 (curl-8_21_0)
Fixed by: https://github.com/curl/curl/commit/557a52f21e37a626725a9e708c02af129c3ece1b (rc-8_23_0-2)