CVE-2026-3784CWE-305

CVE-2026-3784

Medium · published March 11, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
39.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00469 · 39.6th percentile
Weakness
CWE-305 · Authentication Bypass by Primary Weakness
Published
2026-03-11T15:16Z
Affected products (1)
ProductVersionsFixed in
haxx/curl≥ 7.7, < 8.18.08.18.0
References (5)
https://curl.se/docs/CVE-2026-3784.html · 2499f714-1537-4658-8207-48ae4bb9eae9https://curl.se/docs/CVE-2026-3784.json · 2499f714-1537-4658-8207-48ae4bb9eae9https://hackerone.com/reports/3584903 · 2499f714-1537-4658-8207-48ae4bb9eae9http://www.openwall.com/lists/oss-security/2026/03/11/3 · af854a3a-2127-422b-91ae-364da2661108https://cert-portal.siemens.com/productcert/html/ssa-253495.html · 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
EPSS history
Timeline
  • 11 MAR 10:09Z
    wrong proxy connection reuse with credentials
    cvelistv5