proto-default skips SSH verification
CVE-2026-12064 is fixed in 13 products on 1 platform, first by curl 8.18.0-1ubuntu2.3, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Debian 14 | 8.21.0~rc3-1 | DEBIAN-CVE-2026-12064 | Jul 24, 2026 |
| curl · RHEL 10 | 8.12.1-1.el10_0.10 | RHSA-2026:72506 | Jul 3, 2026 |
| curl · Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.5 | curl 8.14.1-2ubuntu1.5 | Jul 21, 2026 |
| curl · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.3 | curl 8.18.0-1ubuntu2.3 | Jun 24, 2026 |
| curl · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| curl · ol 10 | 0:8.12.1-4.el10_2.4 | ELSA-2026-55450 | Aug 17, 2026 |
| curl · opensuse-leap 16.0 | 8.14.1-160000.8.1 | OPENSUSE-SU-2026:21272-1 | Jul 8, 2026 |
| curl · sles 15.6 | 8.22.0-150600.4.58.1 | SUSE-SU-2026:5069-1 | Nov 7, 2026 |
| curl · sles 15.7 | 8.22.0-150700.7.33.1 | SUSE-SU-2026:5068-1 | Nov 7, 2026 |
| curl · sles 16.0 | 8.14.1-160000.8.1 | SUSE-SU-2026:22582-1 | Jul 8, 2026 |
| curl-debuginfo · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| curl-debugsource · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| curl-mini · sles 16.0 | 8.14.1-160000.8.1 | SUSE-SU-2026:22582-1 | Jul 8, 2026 |
| curl-minimal · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| curl-minimal-debuginfo · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl · ol 10 | 0:8.12.1-4.el10_2.4 | ELSA-2026-55450 | Aug 17, 2026 |
| libcurl-debuginfo · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl-devel · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl-devel · ol 10 | 0:8.12.1-4.el10_2.4 | ELSA-2026-55450 | Aug 17, 2026 |
| libcurl-minimal · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl-minimal · ol 10 | 0:8.12.1-4.el10_2.4 | ELSA-2026-55450 | Aug 17, 2026 |
| libcurl-minimal-debuginfo · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl3t64-gnutls · Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.5 | libcurl3t64-gnutls 8.14.1-2ubuntu1.5 | Jul 21, 2026 |
| libcurl3t64-gnutls · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.3 | libcurl3t64-gnutls 8.18.0-1ubuntu2.3 | Jun 24, 2026 |
| libcurl4t64 · Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.5 | libcurl4t64 8.14.1-2ubuntu1.5 | Jul 21, 2026 |
| libcurl4t64 · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.3 | libcurl4t64 8.18.0-1ubuntu2.3 | Jun 24, 2026 |
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