CVE-2026-25832

Mbed TLS Vulnerability Allowing Unadvertised Group During TLS 1.3 HelloRetryRequest

Published Sep 14, 2026 CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Description
In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Mbed TLS Vulnerability Allowing Unadvertised Group During TLS 1.3 HelloRetryRequest
Type Values Removed Values Added
Title Mbed TLS TLS 1.3 Client Accepts HelloRetryRequest with Unadvertised Group
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Mbed TLS TLS 1.3 Client Accepts HelloRetryRequest with Unadvertised Group
Type Values Removed Values Added
First Time appeared Trustedfirmware
Trustedfirmware mbed Tls
Vendors & Products Trustedfirmware
Trustedfirmware mbed Tls
Type Values Removed Values Added
Description In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.
Weaknesses CWE-669
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 14, 2026, 4:00 PM
Reserved
Feb 6, 2026, 12:00 AM
Status
Awaiting Analysis
Published
Sep 14, 2026, 7:17 AM
Modified
Sep 22, 2026, 7:56 PM