CVE-2026-3784

EUVD-2026-11139
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CISA-ADPADP
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
haxxcurl
7.7 ≤
𝑥
< 8.18.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
curl
bookworm
vulnerable
bookworm (security)
vulnerable
bullseye
vulnerable
bullseye (security)
vulnerable
forky
vulnerable
sid
8.19.0-1
fixed
trixie
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
curl
bionic
needed
focal
needed
jammy
Fixed 7.81.0-1ubuntu1.23
released
noble
Fixed 8.5.0-2ubuntu10.8
released
questing
Fixed 8.14.1-2ubuntu1.2
released
trusty
not-affected
xenial
not-affected
Common Weakness Enumeration
References
https://curl.se/docs/CVE-2026-3784.html
https://curl.se/docs/CVE-2026-3784.json
https://hackerone.com/reports/3584903
http://www.openwall.com/lists/oss-security/2026/03/11/3