Information disclosure in cURL - CVE-2026-94265
Published: October 14, 2026
Vulnerability identifier: #VU155672
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-94265
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose Kerberos tickets to an untrusted third-party host.
The vulnerability exists due to improper retention of authentication state in curl's HTTP Negotiate authentication handling when processing an HTTP redirect to a URL containing userinfo. A remote attacker can send a redirect containing arbitrary username and password information from a malicious server to disclose Kerberos tickets to an untrusted third-party host.
The ticket is generated using the ambient identity of the client process. Exploitation does not require the --location-trusted option to be enabled.
Affected software
cURL
How to mitigate CVE-2026-94265
Install security update from vendor's website.
cURL - update to 8.23.0