CVE-2026-34873

9.1 CRITICAL
Published: April 01, 2026 Modified: April 07, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://mbed-tls.readthedocs.io/en/latest/security-advisories/
Source: cve@mitre.org
Vendor Advisory
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-client-impersonation-while-resuming-tls13-session/
Source: cve@mitre.org
Vendor Advisory

2 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.1 / 10.0
EPSS (Exploit Probability)
0.0%
11th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-287

Affected Vendors

arm

Related CVEs

CVE-2026-34626 6.3
CVE-2026-34622 8.6
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