Improper Certificate Validation in cURL - CVE-2026-80230
Published: September 2, 2026
Vulnerability identifier: #VU146681
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80230
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass public key pinning.
The vulnerability exists due to improper certificate validation in libcurl and the curl command line tool when establishing TLS connections with CURLOPT_PINNEDPUBLICKEY configured and peer and host verification disabled. A remote attacker can present a connection without a server certificate to bypass public key pinning.
This issue is present only when curl is built with OpenSSL or a fork such as BoringSSL, AWS-LC, LibreSSL, or QuicTLS, and the insecure configuration also permits certificate-less connections.
Affected software
cURL
How to mitigate CVE-2026-80230
Install security update from vendor's website.
cURL - update to 8.22.0