Vulnerability Details CVE-2026-1677
Zephyr sockets created with `IPPROTO_TLS_1_3` can still negotiate a TLS 1.2 connection when both TLS versions are enabled in Kconfig, because the socket-level protocol selection is not propagated to mbedTLS (e.g. via `mbedtls_ssl_conf_min_tls_version`). The ClientHello advertises both versions and the peer can establish TLS 1.2, so applications that assumed `IPPROTO_TLS_1_3` enforces TLS 1.3 may silently use TLS 1.2 and remain exposed to TLS 1.2-specific weaknesses. As a workaround, the `TLS_CIPHERSUITE_LIST` socket option can be restricted to TLS 1.3-only cipher suites.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 15.4%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2026-1677
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cpe:2.3:o:zephyrproject:zephyr:-
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cpe:2.3:o:zephyrproject:zephyr:1.0.0
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cpe:2.3:o:zephyrproject:zephyr:1.1.0
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cpe:2.3:o:zephyrproject:zephyr:1.10.0
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cpe:2.3:o:zephyrproject:zephyr:1.11.0
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cpe:2.3:o:zephyrproject:zephyr:1.12.0
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cpe:2.3:o:zephyrproject:zephyr:1.13.0
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cpe:2.3:o:zephyrproject:zephyr:1.14.0
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cpe:2.3:o:zephyrproject:zephyr:1.14.1
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cpe:2.3:o:zephyrproject:zephyr:1.14.2
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cpe:2.3:o:zephyrproject:zephyr:1.14.3
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cpe:2.3:o:zephyrproject:zephyr:1.2.0
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cpe:2.3:o:zephyrproject:zephyr:1.3.0
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cpe:2.3:o:zephyrproject:zephyr:1.4.0
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cpe:2.3:o:zephyrproject:zephyr:1.5.0
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cpe:2.3:o:zephyrproject:zephyr:1.6.0
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cpe:2.3:o:zephyrproject:zephyr:1.6.1
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cpe:2.3:o:zephyrproject:zephyr:1.6.99
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cpe:2.3:o:zephyrproject:zephyr:1.7.0
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cpe:2.3:o:zephyrproject:zephyr:1.7.1
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cpe:2.3:o:zephyrproject:zephyr:1.7.99
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cpe:2.3:o:zephyrproject:zephyr:1.8.0
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cpe:2.3:o:zephyrproject:zephyr:1.8.99
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cpe:2.3:o:zephyrproject:zephyr:1.9.0
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cpe:2.3:o:zephyrproject:zephyr:1.9.1
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cpe:2.3:o:zephyrproject:zephyr:1.9.2
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cpe:2.3:o:zephyrproject:zephyr:2.0.0
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cpe:2.3:o:zephyrproject:zephyr:2.1.0
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cpe:2.3:o:zephyrproject:zephyr:2.2.0
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cpe:2.3:o:zephyrproject:zephyr:2.3.0
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cpe:2.3:o:zephyrproject:zephyr:2.4.0
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cpe:2.3:o:zephyrproject:zephyr:2.5.0
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cpe:2.3:o:zephyrproject:zephyr:2.5.1
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cpe:2.3:o:zephyrproject:zephyr:2.6.0
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cpe:2.3:o:zephyrproject:zephyr:2.6.1
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cpe:2.3:o:zephyrproject:zephyr:2.7.0
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cpe:2.3:o:zephyrproject:zephyr:2.79.0
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cpe:2.3:o:zephyrproject:zephyr:2.8.0
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cpe:2.3:o:zephyrproject:zephyr:2.81.0
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cpe:2.3:o:zephyrproject:zephyr:2.82.0
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cpe:2.3:o:zephyrproject:zephyr:2.83.0
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cpe:2.3:o:zephyrproject:zephyr:2.84.0
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cpe:2.3:o:zephyrproject:zephyr:2.85.0
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cpe:2.3:o:zephyrproject:zephyr:2.86.0
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cpe:2.3:o:zephyrproject:zephyr:2.87.0
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cpe:2.3:o:zephyrproject:zephyr:2.88.0
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cpe:2.3:o:zephyrproject:zephyr:2.89.0
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cpe:2.3:o:zephyrproject:zephyr:2.90.0
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cpe:2.3:o:zephyrproject:zephyr:2.91.0
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cpe:2.3:o:zephyrproject:zephyr:2.92.0
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cpe:2.3:o:zephyrproject:zephyr:2.93.0
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cpe:2.3:o:zephyrproject:zephyr:2.94.0
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cpe:2.3:o:zephyrproject:zephyr:2.95.0
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cpe:2.3:o:zephyrproject:zephyr:3.0.0
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cpe:2.3:o:zephyrproject:zephyr:3.0.1
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cpe:2.3:o:zephyrproject:zephyr:3.1.0
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cpe:2.3:o:zephyrproject:zephyr:3.2.0
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cpe:2.3:o:zephyrproject:zephyr:3.2.01
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cpe:2.3:o:zephyrproject:zephyr:3.2.1
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cpe:2.3:o:zephyrproject:zephyr:3.2.31
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cpe:2.3:o:zephyrproject:zephyr:3.2.40
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cpe:2.3:o:zephyrproject:zephyr:3.2.41
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cpe:2.3:o:zephyrproject:zephyr:3.3.0
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cpe:2.3:o:zephyrproject:zephyr:3.4.0
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cpe:2.3:o:zephyrproject:zephyr:3.5.0
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cpe:2.3:o:zephyrproject:zephyr:3.6.0
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cpe:2.3:o:zephyrproject:zephyr:3.7.0
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cpe:2.3:o:zephyrproject:zephyr:3.7.1
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cpe:2.3:o:zephyrproject:zephyr:3.7.2
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cpe:2.3:o:zephyrproject:zephyr:4.0.0
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cpe:2.3:o:zephyrproject:zephyr:4.1.0
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cpe:2.3:o:zephyrproject:zephyr:4.2.0
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cpe:2.3:o:zephyrproject:zephyr:4.2.1
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cpe:2.3:o:zephyrproject:zephyr:4.3.0