Insufficiently protected credentials in cURL - CVE-2026-9079
Published: June 24, 2026
Vulnerability identifier: #VU135085
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-9079
CWE-ID: CWE-522
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: curl.haxx.se
Affected software:
cURL
cURL
Detailed vulnerability description
The vulnerability allows a remote user to disclose proxy authentication credentials.
The vulnerability exists due to insufficiently protected credentials in libcurl proxy authentication handling when clearing proxy authentication credentials. A remote user can reuse a handle after changing proxy credentials to disclose proxy authentication credentials.
The issue affects libcurl and does not affect the curl command line tool.
How to mitigate CVE-2026-9079
Install security update from vendor's website.