CVE-2026-34873

CVE Enrichment

CVSS: 9.1 CRITICAL
EPSS: 0.42%
EPSS Percentile: 35.00%
CISA KEV: Not listed

Description

An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: [email protected]
Published: 02-Apr-2026 04:17
Last Modified: 17-Jun-2026 17:39
EPSS Date: 2026-10-20
CWE: CWE-287

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:H /
                            I:H /
                            A:N

Affected Products / Versions

trustedfirmware / mbed_tls Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 3.5.0 · before (exclusive) 3.6.6
cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*
trustedfirmware / mbed_tls Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 4.0.0 · before (exclusive) 4.1.0
cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*

References

Last enrichment sync: 01-Nov-2026 19:25
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

mbedtls carries seven, including a client impersonation issue, CVE-2026-34873, and a signature algorithm injection issue, CVE-2026-25834. Debian 13.7 Bundles 92 Security Advisories and Updates 106 Packages

CVE (19)

Products (18)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.