What’s Vulnerable › Vulnerabilities

CVE-2026-34871

• Severity: medium (CVSS 6.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-01 · updated 2026-06-17
• Weakness: CWE-338

Description

An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto before 1.1.0. There is a Predictable Seed in a Pseudo-Random Number Generator (PRNG).

Affected products

• mbedtls: before 3.6.6 — fixed in 3.6.6
• TrustedFirmware Tf-Psa-Crypto: before 1.1.0 — fixed in 1.1.0

How to fix

Upgrade to a fixed version: mbedtls 3.6.6; TrustedFirmware Tf-Psa-Crypto 1.1.0. 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-2026-03-dev-random/

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