CVE-2026-34876

The CVE-2026-34876 issue affects Mbed TLS 3.x prior to 3.6.6. An out-of-bounds read in mbedtls_ccm_finish() (library/ccm.c) can reveal adjacent CCM context data when the multipart CCM API is invoked with an oversized tag_len. Root cause: missing validation of tag_len against the internal 16-byte ...