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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
TrustedFirmware Mbed TLS unaffected
Version Status Constraints
3.5.0 affected < 3.6.7
4.0.0 affected < 4.1.2

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://mbed-tls.readthedocs.io/en/latest/security-advisories/ cve-icon cve-icon
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-07-tls13-hrr-unadvertised-group/ cve-icon cve-icon
History

Mon, 14 Sep 2026 07:00:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-14T06:45:01.918Z

Reserved: 2026-02-06T00:00:00.000Z

Link: CVE-2026-25832

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-14T07:17:16.490

Modified: 2026-09-14T07:17:16.490

Link: CVE-2026-25832

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses