Predictable Seed Vulnerability in Mbed TLS from Arm
CVE-2026-34871

6.7MEDIUM

Key Information:

Vendor

Arm
Status
Mbed TLS
Vendor
CVE Published:
1 April 2026

What is CVE-2026-34871?

An issue has been identified in certain versions of Mbed TLS and TF-PSA-Crypto where the Pseudo-Random Number Generator (PRNG) utilizes a predictable seed. This flaw can potentially allow attackers to predict cryptographic keys generated using the compromised random number generator, posing a significant risk to the integrity and confidentiality of data. Users of the affected versions are urged to review the related security advisories and take appropriate measures to upgrade their systems.

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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:
6.7
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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