CVE-2026-5477 Prefix-substitution forgery via integer overflow in wolfCrypt CMAC

An integer overflow existed in the wolfCrypt CMAC implementation, that could be exploited to forge CMAC tags. The function wcCmacUpdate used the guard if cmac-totalSz != 0 to skip XOR-chaining on the first block where digest is all-zeros and the XOR is a no-op. However, totalSz is word32 and wrap...

CVE-2026-5477

An integer overflow existed in the wolfCrypt CMAC implementation, that could be exploited to forge CMAC tags. The function wcCmacUpdate used the guard if cmac-totalSz != 0 to skip XOR-chaining on the first block where digest is all-zeros and the XOR is a no-op. However, totalSz is word32 and wrap...

PT-2026-31875

Name of the Vulnerable Software and Affected Versions wolfCrypt affected versions not specified Description An integer overflow in the wolfCrypt CMAC implementation could allow for the forging of CMAC tags. The wc CmacUpdate function incorrectly skipped XOR-chaining on the first block due to a...