We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.

Please see our statement on Data Privacy.

Crisp.chat (Helpdesk and Chat)

Ok

THREATINT
PUBLISHED

CVE-2025-49600



Description

In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_verify may accept invalid signatures if hash computation fails and internal errors go unchecked, enabling LMS (Leighton-Micali Signature) forgery in a fault scenario. Specifically, unchecked return values in mbedtls_lms_verify allow an attacker (who can induce a hardware hash accelerator fault) to bypass LMS signature verification by reusing stale stack data, resulting in acceptance of an invalid signature. In mbedtls_lms_verify, the return values of the internal Merkle tree functions create_merkle_leaf_value and create_merkle_internal_value are not checked. These functions return an integer that indicates whether the call succeeded or not. If a failure occurs, the output buffer (Tc_candidate_root_node) may remain uninitialized, and the result of the signature verification is unpredictable. When the software implementation of SHA-256 is used, these functions will not fail. However, with hardware-accelerated hashing, an attacker could use fault injection against the accelerator to bypass verification.

Reserved 2025-06-06 | Published 2025-07-04 | Updated 2025-07-04 | Assigner mitre


MEDIUM: 4.9CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

Problem types

CWE-325 Missing Cryptographic Step

Product status

Default status
unaffected

3.3.0 before 3.6.4
affected

References

github.com/...isories/mbedtls-security-advisory-2025-06-3.md

cve.org (CVE-2025-49600)

nvd.nist.gov (CVE-2025-49600)

Download JSON

Share this page
https://cve.threatint.eu/CVE/CVE-2025-49600

Support options

Helpdesk Chat, Email, Knowledgebase