CVE-2026-34873

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Source
https://cve.org/CVERecord?id=CVE-2026-34873
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34873.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-34873
Downstream
Related
Published
2026-04-01T00:00:00Z
Modified
2026-07-15T01:48:54.015858909Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
[none]
Details

An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.

Database specific 
{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "3.5.0"
                },
                {
                    "fixed": "4.0.0"
                }
            ],
            "source": "DESCRIPTION"
        }
    ],
    "cna_assigner": "mitre",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34873.json"
}
References

Affected packages

Git / github.com/mbed-tls/mbedtls

Affected ranges

Type
GIT
Repo
https://github.com/mbed-tls/mbedtls
Events
Introduced
1ec69067fa1351427f904362c1221b31538c8b57
Fixed
0bebf8b8c7f07abe3571ded48a11aa907a1ffb20
Introduced
ec4044008d2d069da38288bc76b0fee34ec78646
Fixed
0fe989b6b514192783c469039edd325fd0989806
Database specific 
{
    "cpe": "cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE",
    "extracted_events": [
        {
            "introduced": "3.5.0"
        },
        {
            "fixed": "3.6.6"
        },
        {
            "introduced": "4.0.0"
        },
        {
            "fixed": "4.1.0"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34873.json"