CVE-2026-34873

CRITICAL

CVSS v3.1: 9.1 · EPSS: 0.0004 (12.2 percentile)

NetworkNo privilegesNo user interactionImproper AuthenticationVendor advisory ref

Source data as of:

At a glance

Severity
CRITICAL
CVSS
9.1 v3.1 · NVD
EPSS
0.0004 (12.2 percentile) · FIRST.org
CISA KEV
No
Type
Improper Authentication · NVD CWE
Attack conditions (CVSS vector)
NetworkNo privilegesNo user interaction · Source: NVD Vector
Affected vendors
trustedfirmware
Published
2026-04-01 · Modified: 2026-06-05
References
Jump to references (2)

CVSS / EPSS / KEV

CVSS v3.1 9.1 / 10 CRITICAL Source: NVD
EPSS 0.0004 12.2 percentile Source: FIRST.org
CISA KEV No Source: CISA

Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources

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.

Record details

CVE ID
CVE-2026-34873
CVSS (v3.1)
9.1 (CRITICAL)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploitability subscore
3.9
Impact subscore
5.2
EPSS
0.0004 (12.2 percentile) — 2026-06-06
CISA KEV
No
Weakness (CWE)
CWE-287
Affected vendors
trustedfirmware
Affected configurations (CPE)
2
Published
2026-04-01
Modified
2026-06-05
Status
Analyzed

References

Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.

Related records

Other records sharing a factual facet, for cross-reference. A descriptive neighbourhood — ordering does not imply priority and is not a recommendation.

Same affected vendor

CVE-2019-1010292 CRITICAL CVSS 9.8 CVE-2019-1010293 CRITICAL CVSS 9.8 CVE-2019-1010295 CRITICAL CVSS 9.8 CVE-2019-1010296 CRITICAL CVSS 9.8

Same weakness type (CWE)

CVE-2026-46389 CRITICAL CVSS 10.0 CVE-2026-6274 CRITICAL CVSS 9.8 CVE-2017-14032 HIGH CVSS 8.1 CVE-2025-10463 HIGH CVSS 7.3

Published the same year

CVE-2026-11414 CRITICAL CVSS 10.0 CVE-2026-11420 CRITICAL CVSS 10.0 CVE-2026-3611 CRITICAL CVSS 10.0 CVE-2026-46389 CRITICAL CVSS 10.0
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