Add cipher suite filtering when downgrade is disabled #9699
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When wolfSSL_SetVersion() is called to set a specific TLS version, the downgrade flag is now set to 0. This causes wolfSSL_parse_cipher_list() to no longer preserve cipher suites from the other TLS version group. Previously, when using SSLv23 method and setting cipher suites for only one TLS version (e.g., TLS 1.2), the library would preserve any existing cipher suites from the other version (e.g., TLS 1.3) for OpenSSL API compatibility. With this change, if a specific version is set via wolfSSL_SetVersion(), only the cipher suites for that version are kept.
SparkiDev
approved these changes
Jan 21, 2026
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When wolfSSL_SetVersion() is called to set a specific TLS version, the downgrade flag is now set to 0. This causes wolfSSL_parse_cipher_list() to no longer preserve cipher suites from the other TLS version group.
Previously, when using SSLv23 method and setting cipher suites for only one TLS version (e.g., TLS 1.2), the library would preserve any existing cipher suites from the other version (e.g., TLS 1.3) for OpenSSL API compatibility. With this change, if a specific version is set via wolfSSL_SetVersion(), only the cipher suites for that version are kept.
Fixes ZD 21068