PT-2026-24664 · Curl+3 · Curl+3

Stefan Eissing · Published 2026-03-11 · Updated 2026-05-04 · CVE-2026-3784

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions curl (affected versions not specified)

Description curl improperly reuses an existing HTTP proxy connection when performing a CONNECT request to a server, even if the new request uses different credentials for the HTTP proxy. The expected behavior is to establish or utilize a distinct connection. This issue involves incorrect handling of proxy connections and authentication.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Weakness Enumeration

CWE-305

Related Identifiers

BDU:2026-07189

CVE-2026-3784

ECHO-F726-AE66-88E1

JLSEC-2026-438

OESA-2026-1704

OPENSUSE-SU-2026:10371-1

OPENSUSE-SU-2026:20404-1

RHSA-2026:6893

SUSE-SU-2026:0879-1

SUSE-SU-2026:0885-1

SUSE-SU-2026:0903-1

SUSE-SU-2026:0911-1

SUSE-SU-2026:0921-1

SUSE-SU-2026:20668-1

SUSE-SU-2026:20722-1

SUSE-SU-2026:20760-1

SUSE-SU-2026:20918-1

USN-8084-1

USN-8099-1

Affected Products

Linuxmint

Red Os

Ubuntu

Curl

References · 76

• 🔥 https://hackerone.com/reports/3584903 · Exploit
• https://osv.dev/vulnerability/JLSEC-2026-438 · Vendor Advisory
• https://curl.se/docs/CVE-2026-3784.json · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:20722-1 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-3784 · Vendor Advisory
• https://curl.se/docs/CVE-2026-3784.html · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10371-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-3783 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-3784 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3784 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:20668-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8099-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0879-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3783 · Security Note
• https://ubuntu.com/security/CVE-2026-1965 · Vendor Advisory