Authentication Bypass by Primary Weakness in cURL - CVE-2026-8932
Published: June 24, 2026
Vulnerability identifier: #VU135079
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-8932
CWE-ID: CWE-305
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 bypass client certificate authentication.
The vulnerability exists due to authentication bypass by primary weakness in libcurl connection reuse logic when reusing a previously established connection after changing mTLS client certificate settings. A remote user can reuse a connection with mismatched client certificate configuration to bypass client certificate authentication.
The issue affects libcurl and does not affect the curl command line tool.
How to mitigate CVE-2026-8932
Install security update from vendor's website.