Algorithm Downgrade Vulnerability in Mbed TLS by Arm
CVE-2026-25834

6.5MEDIUM

Key Information:

Vendor

Arm
Status
Mbed TLS
Vendor
CVE Published:
1 April 2026

What is CVE-2026-25834?

The vulnerability in Mbed TLS versions from 3.3.0 to 3.6.5, as well as version 4.0.0, allows for an algorithm downgrade, which may be exploited by an attacker to weaken cryptographic protections. This security issue could lead to exposure of sensitive information as it undermines the intended configurations for secure communications. Enabling proper security protocols is essential to mitigate risks associated with this vulnerability.

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References

https://mbed-tls.readthedocs.io/en/latest/security-adviso...
https://mbed-tls.readthedocs.io/en/latest/security-adviso...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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