wrong proxy connection reuse with credentials
Summary
| CVE | CVE-2026-3784 |
|---|---|
| State | PUBLISHED |
| Assigner | curl |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-11 11:16:00 UTC |
| Updated | 2026-09-15 07:16:27 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 6.5 MEDIUM from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS: 0.000250000 probability, percentile 0.072810000 (date 2026-06-08)
Problem Types: CWE-305 | CWE-305 Authentication Bypass by Primary Weakness | CWE-305 CWE-305 Authentication Bypass by Primary Weakness
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Curl | Curl | affected 7.7.0 8.14.2 semver | Not specified |
| CNA | Curl | Curl | affected 8.15.0 8.16.1 semver | Not specified |
| CNA | Curl | Curl | affected 8.17.0 8.19.0 semver | Not specified |
| CNA | Curl | Curl | affected a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4 5f13a7645e565c5c1a06f3ef86e97afb856fb364 git | Not specified |
| CNA | Curl | Curl | affected 8.18.0 | Not specified |
| CNA | Curl | Curl | affected 8.17.0 | Not specified |
| CNA | Curl | Curl | affected 8.16.0 | Not specified |
| CNA | Curl | Curl | affected 8.15.0 | Not specified |
| CNA | Curl | Curl | affected 8.14.1 | Not specified |
| CNA | Curl | Curl | affected 8.14.0 | Not specified |
| CNA | Curl | Curl | affected 8.13.0 | Not specified |
| CNA | Curl | Curl | affected 8.12.1 | Not specified |
| CNA | Curl | Curl | affected 8.12.0 | Not specified |
| CNA | Curl | Curl | affected 8.11.1 | Not specified |
| CNA | Curl | Curl | affected 8.11.0 | Not specified |
| CNA | Curl | Curl | affected 8.10.1 | Not specified |
| CNA | Curl | Curl | affected 8.10.0 | Not specified |
| CNA | Curl | Curl | affected 8.9.1 | Not specified |
| CNA | Curl | Curl | affected 8.9.0 | Not specified |
| CNA | Curl | Curl | affected 8.8.0 | Not specified |
| CNA | Curl | Curl | affected 8.7.1 | Not specified |
| CNA | Curl | Curl | affected 8.7.0 | Not specified |
| CNA | Curl | Curl | affected 8.6.0 | Not specified |
| CNA | Curl | Curl | affected 8.5.0 | Not specified |
| CNA | Curl | Curl | affected 8.4.0 | Not specified |
| CNA | Curl | Curl | affected 8.3.0 | Not specified |
| CNA | Curl | Curl | affected 8.2.1 | Not specified |
| CNA | Curl | Curl | affected 8.2.0 | Not specified |
| CNA | Curl | Curl | affected 8.1.2 | Not specified |
| CNA | Curl | Curl | affected 8.1.1 | Not specified |
| CNA | Curl | Curl | affected 8.1.0 | Not specified |
| CNA | Curl | Curl | affected 8.0.1 | Not specified |
| CNA | Curl | Curl | affected 8.0.0 | Not specified |
| CNA | Curl | Curl | affected 7.88.1 | Not specified |
| CNA | Curl | Curl | affected 7.88.0 | Not specified |
| CNA | Curl | Curl | affected 7.87.0 | Not specified |
| CNA | Curl | Curl | affected 7.86.0 | Not specified |
| CNA | Curl | Curl | affected 7.85.0 | Not specified |
| CNA | Curl | Curl | affected 7.84.0 | Not specified |
| CNA | Curl | Curl | affected 7.83.1 | Not specified |
| CNA | Curl | Curl | affected 7.83.0 | Not specified |
| CNA | Curl | Curl | affected 7.82.0 | Not specified |
| CNA | Curl | Curl | affected 7.81.0 | Not specified |
| CNA | Curl | Curl | affected 7.80.0 | Not specified |
| CNA | Curl | Curl | affected 7.79.1 | Not specified |
| CNA | Curl | Curl | affected 7.79.0 | Not specified |
| CNA | Curl | Curl | affected 7.78.0 | Not specified |
| CNA | Curl | Curl | affected 7.77.0 | Not specified |
| CNA | Curl | Curl | affected 7.76.1 | Not specified |
| CNA | Curl | Curl | affected 7.76.0 | Not specified |
| CNA | Curl | Curl | affected 7.75.0 | Not specified |
| CNA | Curl | Curl | affected 7.74.0 | Not specified |
| CNA | Curl | Curl | affected 7.73.0 | Not specified |
| CNA | Curl | Curl | affected 7.72.0 | Not specified |
| CNA | Curl | Curl | affected 7.71.1 | Not specified |
| CNA | Curl | Curl | affected 7.71.0 | Not specified |
| CNA | Curl | Curl | affected 7.70.0 | Not specified |
| CNA | Curl | Curl | affected 7.69.1 | Not specified |
| CNA | Curl | Curl | affected 7.69.0 | Not specified |
| CNA | Curl | Curl | affected 7.68.0 | Not specified |
| CNA | Curl | Curl | affected 7.67.0 | Not specified |
| CNA | Curl | Curl | affected 7.66.0 | Not specified |
| CNA | Curl | Curl | affected 7.65.3 | Not specified |
| CNA | Curl | Curl | affected 7.65.2 | Not specified |
| CNA | Curl | Curl | affected 7.65.1 | Not specified |
| CNA | Curl | Curl | affected 7.65.0 | Not specified |
| CNA | Curl | Curl | affected 7.64.1 | Not specified |
| CNA | Curl | Curl | affected 7.64.0 | Not specified |
| CNA | Curl | Curl | affected 7.63.0 | Not specified |
| CNA | Curl | Curl | affected 7.62.0 | Not specified |
| CNA | Curl | Curl | affected 7.61.1 | Not specified |
| CNA | Curl | Curl | affected 7.61.0 | Not specified |
| CNA | Curl | Curl | affected 7.60.0 | Not specified |
| CNA | Curl | Curl | affected 7.59.0 | Not specified |
| CNA | Curl | Curl | affected 7.58.0 | Not specified |
| CNA | Curl | Curl | affected 7.57.0 | Not specified |
| CNA | Curl | Curl | affected 7.56.1 | Not specified |
| CNA | Curl | Curl | affected 7.56.0 | Not specified |
| CNA | Curl | Curl | affected 7.55.1 | Not specified |
| CNA | Curl | Curl | affected 7.55.0 | Not specified |
| CNA | Curl | Curl | affected 7.54.1 | Not specified |
| CNA | Curl | Curl | affected 7.54.0 | Not specified |
| CNA | Curl | Curl | affected 7.53.1 | Not specified |
| CNA | Curl | Curl | affected 7.53.0 | Not specified |
| CNA | Curl | Curl | affected 7.52.1 | Not specified |
| CNA | Curl | Curl | affected 7.52.0 | Not specified |
| CNA | Curl | Curl | affected 7.51.0 | Not specified |
| CNA | Curl | Curl | affected 7.50.3 | Not specified |
| CNA | Curl | Curl | affected 7.50.2 | Not specified |
| CNA | Curl | Curl | affected 7.50.1 | Not specified |
| CNA | Curl | Curl | affected 7.50.0 | Not specified |
| CNA | Curl | Curl | affected 7.49.1 | Not specified |
| CNA | Curl | Curl | affected 7.49.0 | Not specified |
| CNA | Curl | Curl | affected 7.48.0 | Not specified |
| CNA | Curl | Curl | affected 7.47.1 | Not specified |
| CNA | Curl | Curl | affected 7.47.0 | Not specified |
| CNA | Curl | Curl | affected 7.46.0 | Not specified |
| CNA | Curl | Curl | affected 7.45.0 | Not specified |
| CNA | Curl | Curl | affected 7.44.0 | Not specified |
| CNA | Curl | Curl | affected 7.43.0 | Not specified |
| CNA | Curl | Curl | affected 7.42.1 | Not specified |
| CNA | Curl | Curl | affected 7.42.0 | Not specified |
| CNA | Curl | Curl | affected 7.41.0 | Not specified |
| CNA | Curl | Curl | affected 7.40.0 | Not specified |
| CNA | Curl | Curl | affected 7.39.0 | Not specified |
| CNA | Curl | Curl | affected 7.38.0 | Not specified |
| CNA | Curl | Curl | affected 7.37.1 | Not specified |
| CNA | Curl | Curl | affected 7.37.0 | Not specified |
| CNA | Curl | Curl | affected 7.36.0 | Not specified |
| CNA | Curl | Curl | affected 7.35.0 | Not specified |
| CNA | Curl | Curl | affected 7.34.0 | Not specified |
| CNA | Curl | Curl | affected 7.33.0 | Not specified |
| CNA | Curl | Curl | affected 7.32.0 | Not specified |
| CNA | Curl | Curl | affected 7.31.0 | Not specified |
| CNA | Curl | Curl | affected 7.30.0 | Not specified |
| CNA | Curl | Curl | affected 7.29.0 | Not specified |
| CNA | Curl | Curl | affected 7.28.1 | Not specified |
| CNA | Curl | Curl | affected 7.28.0 | Not specified |
| CNA | Curl | Curl | affected 7.27.0 | Not specified |
| CNA | Curl | Curl | affected 7.26.0 | Not specified |
| CNA | Curl | Curl | affected 7.25.0 | Not specified |
| CNA | Curl | Curl | affected 7.24.0 | Not specified |
| CNA | Curl | Curl | affected 7.23.1 | Not specified |
| CNA | Curl | Curl | affected 7.23.0 | Not specified |
| CNA | Curl | Curl | affected 7.22.0 | Not specified |
| CNA | Curl | Curl | affected 7.21.7 | Not specified |
| CNA | Curl | Curl | affected 7.21.6 | Not specified |
| CNA | Curl | Curl | affected 7.21.5 | Not specified |
| CNA | Curl | Curl | affected 7.21.4 | Not specified |
| CNA | Curl | Curl | affected 7.21.3 | Not specified |
| CNA | Curl | Curl | affected 7.21.2 | Not specified |
| CNA | Curl | Curl | affected 7.21.1 | Not specified |
| CNA | Curl | Curl | affected 7.21.0 | Not specified |
| CNA | Curl | Curl | affected 7.20.1 | Not specified |
| CNA | Curl | Curl | affected 7.20.0 | Not specified |
| CNA | Curl | Curl | affected 7.19.7 | Not specified |
| CNA | Curl | Curl | affected 7.19.6 | Not specified |
| CNA | Curl | Curl | affected 7.19.5 | Not specified |
| CNA | Curl | Curl | affected 7.19.4 | Not specified |
| CNA | Curl | Curl | affected 7.19.3 | Not specified |
| CNA | Curl | Curl | affected 7.19.2 | Not specified |
| CNA | Curl | Curl | affected 7.19.1 | Not specified |
| CNA | Curl | Curl | affected 7.19.0 | Not specified |
| CNA | Curl | Curl | affected 7.18.2 | Not specified |
| CNA | Curl | Curl | affected 7.18.1 | Not specified |
| CNA | Curl | Curl | affected 7.18.0 | Not specified |
| CNA | Curl | Curl | affected 7.17.1 | Not specified |
| CNA | Curl | Curl | affected 7.17.0 | Not specified |
| CNA | Curl | Curl | affected 7.16.4 | Not specified |
| CNA | Curl | Curl | affected 7.16.3 | Not specified |
| CNA | Curl | Curl | affected 7.16.2 | Not specified |
| CNA | Curl | Curl | affected 7.16.1 | Not specified |
| CNA | Curl | Curl | affected 7.16.0 | Not specified |
| CNA | Curl | Curl | affected 7.15.5 | Not specified |
| CNA | Curl | Curl | affected 7.15.4 | Not specified |
| CNA | Curl | Curl | affected 7.15.3 | Not specified |
| CNA | Curl | Curl | affected 7.15.2 | Not specified |
| CNA | Curl | Curl | affected 7.15.1 | Not specified |
| CNA | Curl | Curl | affected 7.15.0 | Not specified |
| CNA | Curl | Curl | affected 7.14.1 | Not specified |
| CNA | Curl | Curl | affected 7.14.0 | Not specified |
| CNA | Curl | Curl | affected 7.13.2 | Not specified |
| CNA | Curl | Curl | affected 7.13.1 | Not specified |
| CNA | Curl | Curl | affected 7.13.0 | Not specified |
| CNA | Curl | Curl | affected 7.12.3 | Not specified |
| CNA | Curl | Curl | affected 7.12.2 | Not specified |
| CNA | Curl | Curl | affected 7.12.1 | Not specified |
| CNA | Curl | Curl | affected 7.12.0 | Not specified |
| CNA | Curl | Curl | affected 7.11.2 | Not specified |
| CNA | Curl | Curl | affected 7.11.1 | Not specified |
| CNA | Curl | Curl | affected 7.11.0 | Not specified |
| CNA | Curl | Curl | affected 7.10.8 | Not specified |
| CNA | Curl | Curl | affected 7.10.7 | Not specified |
| CNA | Curl | Curl | affected 7.10.6 | Not specified |
| CNA | Curl | Curl | affected 7.10.5 | Not specified |
| CNA | Curl | Curl | affected 7.10.4 | Not specified |
| CNA | Curl | Curl | affected 7.10.3 | Not specified |
| CNA | Curl | Curl | affected 7.10.2 | Not specified |
| CNA | Curl | Curl | affected 7.10.1 | Not specified |
| CNA | Curl | Curl | affected 7.10 | Not specified |
| CNA | Curl | Curl | affected 7.9.8 | Not specified |
| CNA | Curl | Curl | affected 7.9.7 | Not specified |
| CNA | Curl | Curl | affected 7.9.6 | Not specified |
| CNA | Curl | Curl | affected 7.9.5 | Not specified |
| CNA | Curl | Curl | affected 7.9.4 | Not specified |
| CNA | Curl | Curl | affected 7.9.3 | Not specified |
| CNA | Curl | Curl | affected 7.9.2 | Not specified |
| CNA | Curl | Curl | affected 7.9.1 | Not specified |
| CNA | Curl | Curl | affected 7.9 | Not specified |
| CNA | Curl | Curl | affected 7.8.1 | Not specified |
| CNA | Curl | Curl | affected 7.8 | Not specified |
| CNA | Curl | Curl | affected 7.7.3 | Not specified |
| CNA | Curl | Curl | affected 7.7.2 | Not specified |
| CNA | Curl | Curl | affected 7.7.1 | Not specified |
| CNA | Curl | Curl | affected 7.7 | Not specified |
| ADP | Siemens | RUGGEDCOM RST2428P | affected V4.0 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| hackerone.com/reports/3584903 | 2499f714-1537-4658-8207-48ae4bb9eae9 | hackerone.com | Exploit, Issue Tracking, Third Party Advisory |
| curl.se/docs/CVE-2026-3784.html | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | Patch, Vendor Advisory |
| curl.se/docs/CVE-2026-3784.json | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | Vendor Advisory |
| cert-portal.siemens.com/productcert/html/ssa-253495.html | 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e | cert-portal.siemens.com | |
| www.openwall.com/lists/oss-security/2026/03/11/3 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Muhamad Arga Reksapati (HackerOne: nobcoder) (en)
CNA: Stefan Eissing (en)
There are currently no legacy QID mappings associated with this CVE.