CVE Alert: CVE-2025-49601

Vulnerability Summary: CVE-2025-49601

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.

Affected Endpoints:

No affected endpoints listed.

Published Date:

7/4/2025, 3:15:22 PM

⚠️ CVSS Score:

Exploit Status:

Not Exploited

References:

• https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-4.md

Recommended Action:

No proposed action available. Please refer to vendor documentation for updates.

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