Authentication Bypass by Primary Weakness in cURL - CVE-2026-5545
Published: April 29, 2026
Vulnerability identifier: #VU128460
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5545
CWE-ID: CWE-305
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
cURL
cURL
Software vendor:
curl.haxx.se
curl.haxx.se
Description
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to wrong reuse of HTTP Negotiate authentication connection. A remote attacker can execute arbitrary requests under the wrong user context.
Remediation
Install updates from vendor's website.