CVE-2026-3784

Name	CVE-2026-3784
Description	curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a separate connection.
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)	bullseye	7.74.0-1.3+deb11u13	vulnerable
	bullseye (security)	7.74.0-1.3+deb11u16	vulnerable
	bookworm	7.88.1-10+deb12u14	vulnerable
	bookworm (security)	7.88.1-10+deb12u5	vulnerable
	trixie	8.14.1-2+deb13u2	vulnerable
	forky	8.19.0-3	fixed
	sid	8.20.0~rc2-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
curl	source	(unstable)	8.19.0-1

Notes

[trixie] - curl <no-dsa> (Minor issue)
[bookworm] - curl <no-dsa> (Minor issue)
[bullseye] - curl <postponed> (Minor issue)
https://curl.se/docs/CVE-2026-3784.html
Introduced with: https://github.com/curl/curl/commit/a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4 (curl-7_7_alpha2)
Fixed by: https://github.com/curl/curl/commit/5f13a7645e565c5c1a06f3ef86e97afb856fb364 (curl-8_19_0)