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CVE-2026-12064

proto-default skips SSH verification

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-12064

Published

When a user invokes curl using a schemeless URL combined with `--proto-default` sftp (or scp), a disconnect occurs between the tool layer and libcurl. The tool layer incorrectly infers the URL scheme, which erroneously bypasses the initialization of critical SSH security options like CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the libcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes the connection via SFTP/SCP as specified. Because the tool layer skipped the security configuration, these SSH host verification options are silently omitted, causing curl to connect to an unverified SSH remote host without throwing an error.

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Affected versions, risk and source history

Exploitation and risk

Source status

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Advisory history

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Sources read 13 Nov 23:46 UTC · 274 of 275 readable · 270 fully read · documentation 469/469 current

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