What’s Vulnerable › Vulnerabilities

CVE-2026-25832

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-22
• Weakness: CWE-669

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.

Affected products

• TrustedFirmware Mbed TLS: from 3.5.0 before 3.6.7; from 4.0.0 before 4.1.2 — fixed in 3.6.7, 4.1.2

How to fix

Upgrade to a fixed version: TrustedFirmware Mbed TLS 3.6.7, 4.1.2. Check the vendor advisory for mitigations.

References

• https://mbed-tls.readthedocs.io/en/latest/security-advisories/
• https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-07-tls13-hrr-unadvertised-group/

Get alerted when CVE-2026-25832 or the next vulnerability affects your stack