CVE-2025-49601 – MbedTLS LMS Public Key Buffer Out-of-Bounds Read

CVE ID : CVE-2025-49601

Published : July 4, 2025, 3:15 p.m. | 1 hour, 44 minutes ago

Description : In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_import_public_key does not check that the input buffer is at least 4 bytes before reading a 32-bit field, allowing a possible out-of-bounds read on truncated input. Specifically, an out-of-bounds read in mbedtls_lms_import_public_key allows context-dependent attackers to trigger a crash or limited adjacent-memory disclosure by supplying a truncated LMS (Leighton-Micali Signature) public-key buffer under four bytes. An LMS public key starts with a 4-byte type indicator. The function mbedtls_lms_import_public_key reads this type indicator before validating the size of its input.

Severity: 4.8 | MEDIUM

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