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CVE-2026-12064

high CVSS 7.5 EPSS 0.4%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-12064 applies to, and the release that fixes it where the sources name one.

curl 8.1.2 fixed in 8.14.2

At a glance

Severity
High
CVSS base score
7.5 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.4% probability of exploitation in the next 30 days, higher than 32% of scored vulnerabilities
Weakness
CWE-295
Published
2026-07-03
NVD CVE.org

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