CVE-2025-49600

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Source
https://cve.org/CVERecord?id=CVE-2025-49600
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-49600.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-49600
Downstream
Related
Published
2025-07-04T00:00:00Z
Modified
2026-08-12T03:30:53Z
Severity
  • 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N CVSS Calculator
Summary
[none]
Details

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.

Database specific 
{
    "cna_assigner":  "mitre",
    "cwe_ids":  [
        "CWE-325"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/49xxx/CVE-2025-49600.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "3.3.0"
                },
                {
                    "fixed":  "3.6.4"
                }
            ],
            "source":  "AFFECTED_FIELD"
        },
        {
            "extracted_events":  [
                {
                    "introduced":  "3.3.0"
                },
                {
                    "fixed":  "3.6.4"
                }
            ],
            "source":  "CPE_FIELD"
        },
        {
            "extracted_events":  [
                {
                    "introduced":  "3.3.0"
                },
                {
                    "fixed":  "3.6.4"
                }
            ],
            "source":  "DESCRIPTION"
        }
    ]
}
References

Affected packages

Git / github.com/mbed-tls/mbedtls

Affected ranges

Type
GIT
Repo
https://github.com/mbed-tls/mbedtls
Events
Introduced
8c89224991adff88d53cd380f42a2baa36f91454
Fixed
c765c831e5c2a0971410692f92f7a81d6ec65ec2
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "3.3.0"
        },
        {
            "fixed":  "3.6.4"
        }
    ],
    "source":  "CPE_RANGE"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-49600.json"