curl: TLS verifyhost bypass in rustls, mbedTLS, and wolfSSL when verifypeer=0

The now-well-known CURLOPTSSLVERIFYHOST-bypass-when-CURLOPTSSLVERIFYPEER=0 defect exists in three of curl's TLS backends: rustls EXPERIMENTAL, mbedTLS, and wolfSSL DNS hostnames only. The documented contract at docs/libcurl/opts/CURLOPTSSLVERIFYPEER.md:57-59: The check that the host name in the...

JLSEC-2026-433 libcurl supports *pinning* of the server certificate public key for HTTPS transfers. Due to an...

libcurl supports pinning of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC...

curl: Certificate Pinning Bypass with wolfSSL backend over HTTP/3

Summary: A security feature bypass exists in libcurl when built with the wolfSSL backend and HTTP/3 support. The Certificate Pinning feature --pinnedpubkey is silently ignored if the user also disables peer verification -k or --insecure . This behavior is inconsistent with other backends like...

curl: Stack Buffer Overflow in cURL wolfSSL Backend (lib/vtls/wolfssl.c)

Summary: A stack-based buffer overflow exists in the wsslstrerror function of cURL's wolfSSL TLS backend. The function uses an unsafe strcpy call, relying solely on a DEBUGASSERT macro for boundary checking. This macro is disabled in production release builds -DNDEBUG, allowing memory corruption...

CVE-2025-10966

curl's code for managing SSH connections when SFTP was done using the wolfSSH powered backend was flawed and missed host verification mechanisms. This prevents curl from detecting MITM attackers and more...

Improper Certificate Validation

Overview Affected versions of this package are vulnerable to Improper Certificate Validation when wolfSSL is used as the TLS backend for QUIC. An attacker can impersonate a legitimate server or perform a man-in-the-middle attack by exploiting a skipped certificate verification. Note: The skip of...

AZL-62038 CVE-2025-5025 affecting package cmake for versions less than 3.30.3-6

libcurl supports pinning of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC...