CVE-2026-73064

Entropy Source Failure Enables Byte Injection in TLS 1.3 Streams

Published Sep 24, 2026 CVSS 3.1 · 2.9 Low EPSS < 1% KEV · Not listed
Description
In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Title Entropy Source Failure Enables Byte Injection in TLS 1.3 Streams
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Trustedfirmware
Trustedfirmware mbed Tls
Vendors & Products Trustedfirmware
Trustedfirmware mbed Tls
Type Values Removed Values Added
Description In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.
Weaknesses CWE-394
References
Metrics cvssV3_1

{'score': 2.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 24, 2026, 6:00 PM
Reserved
Aug 10, 2026, 7:25 PM
Status
Awaiting Analysis
Published
Sep 24, 2026, 3:17 PM
Modified
Sep 24, 2026, 9:04 PM