TI-2026-27107 Aliases CVE-2026-34871 GHSA-rjq9-c3rf-c638

An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto…

LOW 29CWE-338Published 2026-04-01 · Updated 2026-04-01

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00199 9th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:arm:mbed_tls::::::::	before 3.6.6	Vulnerable	Arm
cpe:2.3:a:trustedfirmware:tf-psa-crypto::::::::	before 1.1.0	Vulnerable	OP-TEE

cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* Versions before 3.6.6 Vulnerable ·Arm
cpe:2.3:a:trustedfirmware:tf-psa-crypto:*:*:*:*:*:*:*:* Versions before 1.1.0 Vulnerable ·OP-TEE

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-34871
2026-10-03 Alias added: GHSA-rjq9-c3rf-c638

References

Advisory 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences